JP2001329657A - Sleeve joint for connecting reinforcing bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sleeve joint capable of ensuring the strength around a hole for grout injection and air vent and preventing itself from getting snagged on another building member such as a hoop bar and the like. SOLUTION: The sleeve joint 20 is provided with a cylindrical joint body 21 and a padding part 25 protruded from the inner periphery of the joint body 21 toward the inside in the diametral direction thereof. A grout injecting hole 20a passes through the joint body 21 and the padding part 25 in the diametral direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve joint for connecting a pair of reinforcing bars arranged in a straight line.

[0002]

2. Description of the Related Art As shown in FIG.
It has a cylindrical shape, and a pair of radially projecting cylindrical portions 2 is provided on the outer periphery thereof. The internal space of the cylindrical portion 2 (holes for grout injection and air release) is connected to the internal space of the joint 1. After inserting a pair of rebars (not shown) from both ends of the sleeve joint 1, a grout material is injected from one cylindrical portion 2, and air is released from the other cylindrical portion 2. By filling the grout material between the inner periphery of the joint 1 and the reinforcing bar, the pair of reinforcing bars are connected.

[0003]

In the above conventional structure,
Rather than simply forming a hole for grout injection or air bleeding on the peripheral wall of the joint 1, the strength around the hole is ensured by projecting the cylindrical portion 2 having the hole from the joint 1. However, the tubular portion 2 is easily caught when another building member such as a hoop is arranged. The present invention has been made in view of the above circumstances, and provides a sleeve joint that can secure strength around a hole for grout injection or air release and that can be prevented from being caught by another building member such as a hoop streak. It is in.

[0004]

According to a first aspect of the present invention, there is provided a joint body having a cylindrical shape, and a built-up portion protruding radially inward from an inner periphery of the joint body. A hole for grout injection or air vent penetrates the joint body and the build-up portion in the radial direction.

A second invention is characterized in that, in the first invention, the build-up portion has an annular shape extending in a circumferential direction of the joint body. A third invention is characterized in that, in the second invention, a projection height of the build-up portion is continuously reduced toward both ends along the axial direction of the joint body.

According to a fourth aspect of the present invention, in the first aspect, the build-up portion has a circular or polygonal shape centered on the hole. A fifth invention is characterized in that, in the fourth invention, the projecting height of the build-up portion continuously decreases toward the periphery.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a distance from an axis of the joint body to the overlaid portion is larger than a radius of a reinforcing bar to be connected. I do. In a seventh aspect based on the sixth aspect, a plurality of projections that are discontinuous in the circumferential direction are arranged on the inner periphery of the joint main body in a dispersed manner in the circumferential direction. It is characterized by being larger than the raised part. An eighth invention is characterized in that, in any one of the first to seventh inventions, the build-up portion is arranged at an axially central portion of the joint body.

According to a ninth invention, in any one of the first to fifth inventions, the build-up portion is disposed at an axially central portion of the joint main body, and the build-up portion is arranged from an axis of the joint main body. The distance to the part is smaller than the radius of the reinforcing bar to be connected.

In a tenth aspect based on the second or third aspect, the overlaid portion is disposed at an axially central portion of the joint body, and extends from an axis of the joint body to the overlaid portion. The distance is smaller than the radius of the reinforcing bar to be connected, and a concave groove for flowing the grout material in the axial direction of the joint body is formed in the overlaid portion.

In an eleventh aspect based on the ninth or tenth aspect, a plurality of circumferentially discontinuous protrusions are arranged on the inner periphery of the joint body in a dispersed manner in the circumferential direction. The protruding height of the overlay portion is large.

In a twelfth aspect based on the seventh or eleventh aspect, an annular projection extending in a circumferential direction is further formed on an inner periphery of the joint body, and the annular projection is radially inward from the annular projection. It is characterized by protruding.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a connection structure in which a pair of deformed reinforcing bars 10 are connected by a sleeve joint 20. A pair of ribs 11 extending in the axial direction and a number of bushes 12 extending in the circumferential direction are formed on the outer periphery of the deformed reinforcing bar 10.

The sleeve joint 20 has 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-described length, depending on the performance and which part of the building structure is used. It is appropriately selected within a range of 3.5 to 40.5 times the nominal diameter.

A plurality of annular projections 22 extending in the circumferential direction are formed on the inner periphery of the joint body 21. These annular projections 22 are arranged at equal intervals in the axial direction of the joint body 21.

A built-up portion 25 is formed on the inner periphery of the center of the joint body 21 so as to be raised inward in the radial direction. The overlay 25 has an annular shape extending in the circumferential direction of the joint body 21. The protrusion height of the built-up portion 25 is the same as that of the annular protrusion 2.
It is almost equal to 2. From the axis of the joint body 21 to the overlaid portion 25
The distance up to the radius of the rebar 10 (the rib 11 and the
(Including thickness). The protruding height of the built-up portion 25 decreases continuously toward both ends along the axial direction of the joint body 21.

The joint body 21 is formed with a grout injection hole 20a penetrating from the overlaid portion 25 to the outer peripheral surface. The grout material 30 injected from the grout injection hole 20 a is filled between the sleeve joint 20 and the reinforcing bar 10. As the grout material 30, an organic grout material such as epoxy mortar is used.

As shown in FIG. 2 and FIG.
Has six (plural) virtual band-shaped regions R1 to R6 extending in the axial direction. These band-shaped regions R1 to R6
Are divided every 60 degrees (equal angle) in the circumferential direction of the joint body 21. Three or four (plural) vertical protrusions 23 are formed at equal intervals in the axial direction in each of the band-shaped regions R1 to R6 (the vertical protrusions 23 are dispersed in the circumferential direction and the axial direction of the joint body 21). Is arranged). Adjacent belt-shaped region R1
From R6 to R6, the position of the vertical projection 23 is shifted in the axial direction. Note that, instead of disposing the vertical projections 23 at equal intervals in the axial direction of the joint body 21, for example, the joint body 2
1 are arranged at both ends (or between the both ends and the center) in close proximity to each other, and are separated from it by one (or 2) at the center.
And may be arranged at various intervals.

As shown in FIG. 1 to FIG.
Has a plate-like shape and is elongated in the axial direction (it forms a non-annular shape that is discontinuous in the circumferential direction,
3 away. ) Both ends of the vertical projection 23 are rounded (the height of the projection of the vertical projection 23 becomes smaller toward both ends).

The grout injection hole 20a is formed in the belt-shaped region R1.
Is located. The projecting height of the vertical projection 23 in the band-shaped region R1 is larger than those in the other regions R2 to R6. The next largest is the band-shaped regions R2 and R6 on both sides of the band-shaped region R1.
Next to the vertical projections 23, the vertical projections 23 of the adjacent strip-shaped regions R3 and R5 are further arranged. As described above, the projection height of the vertical projection 23 in a region farther from the band-shaped region R1 is smaller, and the band-shaped region R radially opposed to the band-shaped region R1.
4 are the smallest. Band-shaped region R1
To R3, R5 and R6, as well as a strip-shaped region R4.
The vertical protrusion 23 also has a larger protruding height than the annular protrusion 22 and the overlaid portion 25. The annular projections 22 at both ends of the joint body 21 may have the same height as the vertical projections 23 in the band-shaped region R4.

The operation will be described. When connecting the pair of reinforcing bars 10, these reinforcing bars 10 are inserted into the sleeve joint 20 from both ends. At this time, the vertical projections 23 are
Since it is more protruding, the reinforcing bar 10 does not hit the annular protrusion 21. Further, since the ends of the vertical projections 23 are rounded, there is no possibility that the reinforcing bar 10 is caught by the vertical projections 23 and cannot be inserted. Further, since the vertical projection 23 extends in the axial direction, the reinforcing bar 10 can be slid along the vertical projection 23. Thereby, the rebar 10 can be easily inserted.

The inserted rebar 10 is positioned so that the axis of the rebar 10 coincides with the axis of the sleeve joint 20 as much as possible. At this time, since the vertical projections 23 are dispersedly arranged in the circumferential direction of the joint main body 21, the eccentricity of the reinforcing bar 10 can be restricted over 360 degrees, and the positioning can be easily performed. Since the distance from the axis of the joint 20 to the overlay 25 is larger than the radius of the reinforcing bar 10, the end of the reinforcing bar 10 is located radially inward of the overlay 25.

Next, the grout material 30 is inserted into the grout injection hole 2.
0a is injected between the sleeve joint 20 and the reinforcing bar 10. At this time, the vertical projections 23 of the band-shaped region R1 prevent the reinforcing bar 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 may increase. And can be easily injected. The injected grout material 30 can flow in the axial direction between the vertical projections 23 of the adjacent band-shaped regions R1 to R6. In addition, the vertical projection 23 is the annular projection 2
2, the annular projection 22 and the reinforcing bar 10
Can be formed reliably, and the grout material 30 can be reliably circulated in the axial direction through this gap. In addition, the grout material 30 includes the respective band-shaped regions R1 to R1.
R6 can flow in the circumferential direction between the vertical projections 23.
Thereby, the grout material 30 is evenly distributed in the axial direction and the circumferential direction.

When the reinforcing bar 10 has a diameter larger than the regular size due to a manufacturing error, (projection height of the vertical projection 23 in the band-shaped region R1)> (projection height of the vertical projection 23 in the band-shaped region R4). ), Using the dimensional relationship
0 is positively biased toward the band-shaped region R4 and positioned. Thereby, the reinforcing bar 10 and the grout injection hole 20a
Can be secured to the same extent as in the case of regular dimensions, and an increase in injection resistance can be prevented. On the other hand, it is possible to secure a space between the reinforcing bar 10 and the band-shaped region R4 by the height of the vertical protrusion 23, and the grout material 30 can be spread there.

When the grout material 30 filled between the reinforcing bar 10 and the sleeve joint 20 hardens, the reinforcing bar 1
0 and the sleeve joint 20 are connected, and thus the pair of reinforcing bars 10 are connected. An annular projection 22 and a vertical projection 23 are formed on the sleeve joint 20, and a rib 11 and a fusible 12 are formed on the reinforcing bar 10.
A bond strength of 0 can be ensured. by this,
When a tensile load is applied to the reinforcing bar 10, the load can be reliably transmitted to the sleeve joint 20 via the grout material 30.

The distribution of the load transmitted to the sleeve joint 20 is largest at the center of the joint 20 and becomes smaller toward both ends. However, since the built-up portion 25 is provided at the center, sufficient strength can be secured against the above-mentioned large load. Moreover,
Since the built-up portion 25 has an annular shape, the strength can be secured over the entire periphery of the central portion. In particular, stress concentration occurs around the grout injection hole 20a, but sufficient strength can be ensured by the built-up portion 25 against this stress concentration. Further, since the build-up portion 25 is continuously lowered toward both ends along the axial direction, stress concentration does not occur at both ends of the build-up portion 25. On the other hand, the thickness of both ends of the joint body 21 having a small load can be reduced. Thereby, the weight of the joint 20 can be reduced.

Since the overlaid portion 25 is formed on the inner periphery of the joint main body 20, it does not catch on other building members such as hoops, and does not hinder the construction of this building member.

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 in the drawings, and description thereof will be omitted. 4 and 5 show a second embodiment of the present invention. In this embodiment, the build-up portion 25 'has a perfect circular shape (discontinuous in the circumferential direction of the joint body 21). Thereby, the weight of the joint 20 can be further reduced. In addition, the height of the built-up portion 25 'continuously decreases toward the periphery thereof. Therefore, stress concentration does not occur on this peripheral edge.
In addition, instead of making this overlaid portion 25 'a true circle,
The shape may be an ellipse, or a polygon such as a triangle, a quadrangle, or a hexagon.

FIG. 6 and FIG. 7 show a third embodiment of the present invention. In this embodiment, the overlay 25 ”
Has an annular shape as in the first embodiment, but has a larger protruding height than the first embodiment, and is larger than the vertical projections 23 of the band-shaped region R1. The distance from the top of the overlay 25 ″ to the axis of the joint body 21 is smaller than the radius of the reinforcing bar 10.

Six (plural) concave grooves 25a are formed in the built-up portion 25 ". These concave grooves 25a are arranged at intervals of 60 degrees in the circumferential direction (separately arranged in the circumferential direction). Each groove 25a extends in the axial direction, and both ends thereof reach the middle abdomen of the built-up portion 25 ". The distance from both ends of the groove 25 a to the axis of the joint body 21 is larger than the radius of the reinforcing bar 10.

In the third embodiment, since the protruding height of the built-up portion 25 "is large, the strength of the central portion of the joint 20 including around the grout injection hole 20a can be further increased. The end of the reinforcing bar 10 is overlaid 25 "
The positioning of the rebar 10 in the axial direction can be performed. The grout material 30 injected from the grout injection hole 20a can be filled between the inner circumference of the joint main body 21 and the outer circumference of the reinforcing bar 10 by passing through the concave groove 25a.

The present invention is not limited to the above embodiment, but can adopt various forms. For example, a hole for venting air may be formed in the sleeve joint in addition to the grout injection hole. Of course, the present invention is also applicable to this air vent hole. The annular protrusion 22 may be eliminated from the inner periphery of the joint body 21. The grout material may be an inorganic material. As for the built-up portion 25 ′ that is discontinuous in the circumferential direction of the joint body 21, similarly to the third embodiment,
The distance from the axis of the joint body 21 to the radius of the reinforcing bar 10 may be smaller than the radius of the reinforcing bar 10, which may also be used for positioning the reinforcing bar 10 in the axial direction. The length of the vertical projection 23 is
2 may be larger than the distance between the vertical projections 23
May be formed over the entire length of the joint body 21. The protrusion heights of all the vertical projections 23 may be the same.
Instead of the plate-like vertical projections 23, spherical or polygonal cross-section projections may be provided.

[0032]

As described above, in the first invention,
The strength around the hole for grout injection and air release can be ensured, and furthermore, it can be prevented from being caught by other building members such as hoop streaks. In the second invention, the strength can be secured over the entire circumference of the joint body. According to the third aspect, it is possible to prevent the occurrence of stress concentration at both ends of the build-up portion.
According to the fourth aspect, the joint can be prevented from becoming heavy. Fifth
According to the invention, it is possible to prevent stress concentration from occurring at the peripheral edge of the built-up portion. According to the sixth aspect, the reinforcing bar can be inserted deeply without being locked to the overlay. According to the seventh aspect, the eccentricity of the reinforcing bar can be restricted, and the reinforcing bar can be prevented from hitting the overlay. Further, the adhesive strength of the grout material can be secured. According to the eighth aspect, the periphery of the hole at the center can be reliably reinforced. According to the ninth aspect, the periphery of the hole at the center can be more reliably reinforced. In addition, the rebar can be positioned in the axial direction. First
In the invention of No. 0, the rebar can be positioned in the axial direction. Further, the grout material can be circulated in the axial direction through the concave groove. Furthermore, the central portion of the joint including the periphery of the hole can be more reliably reinforced, while the thickness of the joint end having a small load can be reduced, and the weight of the joint can be reduced. According to the eleventh aspect, the eccentricity of the reinforcing bar can be restricted. Further, the adhesive strength of the grout material can be secured. In the twelfth aspect, the adhesive strength of the grout material can be further increased.

[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.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1, showing the connection structure before grout material injection.

FIG. 3 is a development view of the inner periphery of the sleeve joint having the above-described connection structure.

FIG. 4 is a longitudinal sectional view of a connection structure according to a second embodiment of the present invention.

FIG. 5 is a development view of an inner periphery of a sleeve joint in the connection structure according to the second embodiment.

FIG. 6 is a longitudinal sectional view of a connection structure according to a third embodiment of the present invention.

FIG. 7 is a sectional view of the sleeve joint taken along the line VII-VII of FIG. 6;

FIG. 8 is a longitudinal sectional view of a conventional sleeve joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Deformed bar 20 Sleeve joint 20a Grout injection hole 21 Joint main body 22 Annular protrusion 23 Vertical protrusion (projection) 25, 25 ', 25 "Overlay portion 25a Groove

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[Procedure amendment]

[Submission date] July 19, 2000 (2007.1)
9)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 4

FIG. 7

FIG. 8

FIG. 2

FIG. 3

FIG. 5

FIG. 6

Claims (12)

[Claims] 1. A joint body having a cylindrical shape, and a built-up portion protruding radially inward from an inner periphery of the joint body,
A sleeve joint for rebar connection, characterized in that a hole for grout injection or air vent penetrates through radially in the joint body and the build-up portion. 2. The rebar connection sleeve joint according to claim 1, wherein the build-up portion has an annular shape extending in a circumferential direction of the joint body. 3. The sleeve joint for reinforcing bar connection according to claim 2, wherein the projecting height of the build-up portion decreases continuously toward both ends along the axial direction of the joint main body. . 4. The method according to claim 1, wherein the build-up portion has a circular or polygonal shape centered on the hole.
Sleeve coupling for rebar connection according to 4. 5. The sleeve joint for reinforcing bar connection according to claim 4, wherein the projecting height of the build-up portion decreases continuously toward the periphery. 6. The reinforcing bar connecting sleeve according to claim 1, wherein a distance from an axis of the joint body to the overlaid portion is larger than a radius of a reinforcing bar to be connected. Fittings. 7. A plurality of projections, which are discontinuous in the circumferential direction, are arranged on the inner periphery of the joint main body in a dispersed manner in the circumferential direction, and the height of the projections is greater than the build-up portion. The sleeve joint for reinforcing bar connection according to claim 6. 7. The joint body according to claim 1, wherein the build-up portion is disposed at an axially central portion of the joint body.
The sleeve joint for rebar connection according to any one of the above. 9. The overlaid portion is disposed at an axial center of the joint body, and a distance from an axis of the joint body to the overlaid portion is smaller than a radius of a reinforcing bar to be connected. The sleeve joint for reinforcing bar connection according to any one of claims 1 to 5, characterized in that: 10. The cladding portion is disposed at a central portion in the axial direction of the joint body, a distance from an axis of the joint body to the cladding portion is smaller than a radius of a reinforcing bar to be connected, 4. The sleeve joint according to claim 2, wherein a concave groove for flowing a grout material in an axial direction of the joint main body is formed in the overlay portion. 5. 11. A plurality of projections, which are discontinuous in the circumferential direction, are arranged on the inner periphery of the joint main body in a dispersed manner in the circumferential direction, and the projection height of the built-up portion is larger than the projections. The sleeve joint for reinforcing bar connection according to claim 9 or 10. 12. The joint body according to claim 7, wherein an annular projection extending in a circumferential direction is further formed on an inner periphery of the joint body, and the projection projects radially inward from the annular projection. 12. The sleeve joint for reinforcing bar connection according to 11.