JP2016180252A - Mechanical joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanical joint that can splice a butt end of a rebar in a simple configuration without requiring a special structure and a tool.SOLUTION: A mechanical joint S is concerned for splicing butt side ends K1 of multiple rebars K. The mechanical joint S includes a cover member 1, wedge pieces 2 inserted into wedge insertion spaces, and a rotary member 3 for pressing the wedge pieces 2. A pressing part 32 coming in contact or coming close in the outer circumferential point of a minor axis part with multiple wedge pieces 2 disposed between each of the butt side ends K1 and the inner wall of the cover member 1 is rotated. Thereby, the pressing part 32 can displace the pressing part 32 to the press-contacting direction with multiple wedge pieces 2, 2 disposed between each of the butt side ends K1 and the inner wall of the cover member 1 in the outer circumferential point of a major axis part. By this displacement, a distance between the multiple wedge pieces 2 disposed between each of the butt side ends K1 and the inner wall of the cover member 1 is pressed and extended by the pressing part 32.SELECTED DRAWING: Figure 1

Description

  The present invention is for construction, and relates to a mechanical joint for connecting ends of a plurality of reinforcing bars.

In a construction site, it may be necessary to connect the ends of a plurality of reinforcing bars constituting reinforced concrete in a butted state.
In order to connect the end portions of such reinforcing bars, a method such as fastening the ends with a fastening material, press-welding (welding) the ends, and grout filling such as non-shrink mortar may be used.
However, various techniques have been proposed in which mechanical joints are used as a method that can easily and more reliably connect the ends of reinforcing bars to improve quality and reduce the amount of reinforcing bars to reduce costs (for example, patent documents). 1 and Patent Document 2).

Patent Document 1 discloses a joint structure for reinforcing bars.
The ends of the reinforcing bars that are joined together in abutting manner are respectively inserted into the inner holes of the lock bolts. And this lock bolt is stored in the inner hole of a hollow cylindrical joint main body. At this time, the outer surface of the lock bolt and the inner surface of the joint main body are threaded, and both are configured to be screwed together.
And the part which protrudes from the lock bolt in the butt | matching side edge part of a reinforcing bar is struck and deformed by a press etc., and the lock bolt is prevented from coming off by the deformation.
In addition, both threading is formed in the left-right reverse direction, and by rotating a joint main body in this state, both lock bolts can be drawn and the abutting side edge part of a reinforcing bar can be spliced together.
In the technique of Patent Document 2, the reinforcing bar is a threaded reinforcing bar, and both ends of the butted portion are inserted into the first coupler and the second coupler (inserted in a screwed state), and these first couplers are inserted. The second coupler (which is screwed into the collar inner hole) is accommodated in the hollow cylindrical collar inner hole. Note that a locking portion for locking the first coupler is provided at one end of the collar, and this locking portion prevents the first coupler from coming off.
In this state, the abutting side ends of the screw reinforcing bars are joined together by performing a tightening operation.

JP 09-279768 A JP-A-10-018510

In this way, the butt portion of the reinforcing bar can be joined using a mechanical joint as shown in Patent Document 1 and Patent Document 2.
However, in the technique described in Patent Document 1, a hollow lock bolt is required, and the abutting side end of the lock bolt needs to be deformed by pressure to prevent the lock bolt from coming off.
Further, the technique described in Patent Document 2 requires screw rebars and requires components such as couplers, and the structure is complicated.
For this reason, there has been a demand for the development of a mechanical joint that can connect the butt portion of the rebar relatively easily without requiring a special structure or tool.
In addition, development of a technique that does not require special processing and does not cause a difference due to the skill of the installer has also been desired.

  An object of the present invention is to solve the above-mentioned problems, and to provide a mechanical joint that can connect a butt end portion of a reinforcing bar with a simple configuration without requiring a special structure or tool. is there.

  According to the mechanical joint of the first aspect, the above-described problem is a mechanical joint for joining together end portions of a plurality of reinforcing bars, and the mechanical joint is a butt side of the plurality of reinforcing bars. A cover member that covers the end portion, a wedge piece that is inserted into a wedge insertion space that is a gap formed between the inner wall of the cover member and the abutting side end portion, and rotation for pressing the wedge piece A plurality of wedge pieces, and each of the plurality of wedge pieces is arranged between each of the abutting side end portions of a plurality of reinforcing bars and the inner wall of the cover member, and the rotation piece The member is configured to include a pressing portion disposed between the plurality of wedge pieces disposed between the abutting side end portions of the plurality of reinforcing bars and the inner wall of the cover member, and the pressing portion Is a flat plate member having a major axis and a minor axis A plurality of wedge pieces arranged between each of the abutting side end portions of a plurality of reinforcing bars and the inner wall of the cover member, and the pressing portion that is in contact with or close to the outer peripheral point of the short diameter portion. By rotating, the pressing portion is in a pressure-contact direction with the plurality of wedge pieces disposed between the abutting side end portions of the plurality of reinforcing bars and the inner wall of the cover member at the outer peripheral point of the long diameter portion. It is possible to displace the pressing portion to the side, and by the displacement, the distance between the plurality of wedge pieces arranged between the abutting side end portions of the plurality of reinforcing bars and the inner wall of the cover member is reduced. The problem is solved by expanding the pressure by the pressing portion.

As described above, in the mechanical joint according to the present invention, the wedge pieces arranged between the respective abutting side ends and the inner wall of the cover member (wedge insertion space) are simply pressed to enter the wedge insertion space. It is possible to bite pieces.
In other words, the pressing portion constituting the rotating member uses a flat plate having a major axis and a minor axis, so that, at the initial setting stage, the short axis portion is in contact with or close to the wedge pieces. When the pressing member is set and then the pressing member is rotated, the pressing member is displaced so that the long axis portion is pressed between the wedge pieces.
In other words, it rotates while pushing away the distance between the wedge pieces.
Therefore, the wedge piece can completely bite into the wedge insertion space.
Thereby, a some reinforcing bar will be joined with respect to a cover member.
In this way, a plurality of reinforcing bars can be easily joined simply by rotating the pressing portion constituting the rotating member.
In addition, as a shape having a major axis and a minor axis, a figure such as a substantially oval shape or a rhombus is assumed, but for example, a figure such as a square, a rectangle, or the like whose side length and diagonal length are different. However, since it becomes possible to apply by making one side correspond to the short axis and the diagonal line correspond to the long axis, such a figure is not excluded.

  At this time, as a specific configuration, as described in claim 2, the rotating member includes a connecting rod portion that is a rod-shaped member, and two rotating members disposed at both ends of the connecting rod portion. The rotating member is arranged so as to bridge the inner wall surface of the cover member, and the two pressing portions face the inner wall surface of the cover member, respectively. When the two wedge pieces are arranged so as to face the pressing portion with respect to one end portion on the abutting side, the wedge portions are connected in many places by interlocking the pressing portions. It is suitable because it can be fastened.

  More specifically, as described in claim 3, a cover-side jig through hole is formed in the cover member, and the pressing portion communicates with the cover-side jig through hole. When the pressing part side jig insertion hole to be formed is formed, it is preferable because the rotating member can be easily rotated by access from the communication hole.

Further, at this time, as described in claim 4, when at least one protrusion is formed on the outer peripheral portion of the pressing member, the contact between the wedge piece and the pressing portion can be improved. As a result, the wedge piece can be more surely bitten into the wedge insertion space.
At this time, as described in claim 5, when the protrusion is formed at a position symmetrical with respect to the center point on the outer peripheral portion of the pressing member, the pressing member engages with the wedge piece in a well-balanced manner and presses it. This is preferable.

According to the mechanical joint according to the present invention, the rotating member (the pressing portion constituting the rotating member) is rotated with the wedge piece disposed between each abutting side end and the inner wall of the cover member (wedge insertion space). Thus, it is possible to easily push the wedge piece into the wedge insertion space.
In other words, the rotating member (a pressing portion constituting the rotating member) can push the wedge piece into the wedge insertion space by rotating if the distance between the wedge pieces is increased.
In this way, a plurality of reinforcing bars can be easily joined simply by rotating the pressing portion constituting the rotating member.
In addition, by connecting the cover side jig through hole formed in the cover member and the pressing portion side jig insertion hole formed in the pressing portion to form a communication hole, it is easy to access from the communication hole. It is preferable because the rotating member can be rotated.
Specifically, for example, a jig such as a hexagon wrench can be inserted into the communication hole, and the rotating member can be easily rotated.
In addition, by providing a protrusion on the pressing portion that constitutes the rotating member, the friction or gripping force between the wedge piece and the pressing portion is increased, and the wedge piece is more reliably bitten into the wedge insertion space. Can do. It should be noted that a balanced transmission of the pressing force can be realized by arranging the protrusions symmetrically with respect to the center point of the pressing portion.
Thus, according to the present invention, a butt end portion of a reinforcing bar can be joined with a simple configuration without requiring a special structure or tool.
For this reason, it is possible to provide a high-quality product while minimizing the influence of the weather and the skill of the installer.

It is an isometric view explanatory drawing of the mechanical coupling which concerns on one Embodiment of this invention. It is the BB sectional view taken on the line of FIG. FIG. 2 is a plan view in the A direction of FIG. 1. It is function explanatory drawing of the mechanical coupling which concerns on one Embodiment of this invention. It is explanatory drawing which shows the mechanical coupling which concerns on the modification of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Note that the configuration described below does not limit the present invention and can be variously modified within the scope of the gist of the present invention.
The present embodiment relates to a mechanical joint that does not require a special structure or tool and can join the butt end of a reinforcing bar with a simple configuration.

1 to 4 show an embodiment according to the present invention. FIG. 1 is a perspective explanatory view of a mechanical joint, FIG. 2 is a sectional view taken along line BB in FIG. 1, and FIG. FIG. 4 is a functional explanatory view of a mechanical joint.
FIG. 5 is an explanatory diagram showing a modified example of the present invention.

The configuration of the mechanical joint S according to this embodiment will be described with reference to FIG.
The mechanical joint S according to this embodiment includes a cover member 1, a wedge piece 2, and a rotating member 3.
The cover member 1 is a cylindrical member, and is configured such that the end of the reinforcing bar K can be inserted into the inner hole thereof.
Two cover side jig through holes 11 are formed in the cover member 1.
The cover-side jig through hole 11 is formed at a position that penetrates the cover member 1 at the shortest distance.
In the present embodiment, the two cover-side jig through holes 11 are formed so that the rotating member 3 described later can be accessed from both sides. However, only one side (that is, one) may be formed.

The wedge pieces 2 are wedges having inclined surfaces formed in a tapered shape, and four wedge pieces are used in this embodiment.
Briefly, the wedge piece 2 includes a rectangular wedge-side bottom surface 21, a wedge-side pressing surface 22 that stands vertically from one side of the wedge-side bottom surface 21, and the other side of the wedge-side bottom surface 21 (wedge-side pressing surface). And a wedge-side inclined surface 23 that connects the other side of the wedge-side bottom surface 21 (the side facing the side continuous with the wedge-side bottom surface 21). .

For this reason, the distance between the wedge-side bottom surface 21 and the wedge-side slope 23 is maximized at the standing position of the wedge-side bottom surface 21, and the other side of the wedge-side bottom surface 21 (side opposite to the side where the wedge-side pressing surface 22 stands) is on the side. Gradually reduce to a minimum.
Therefore, the wedge piece 2 from the other side of the wedge-side bottom surface 21 (the side opposite to the side where the wedge-side pressing surface 22 rises) into some gap (in this embodiment, a wedge insertion space M described later). When the wedge side pressing surface 22 is pressed, the wedge piece 2 bites into the gap (wedge insertion space M) and plays a role as a normal wedge.

The rotating member 3 includes a connecting rod portion 31 and two pressing portions 32.
The connecting rod portion 31 is a cylindrical rod-like body, and the pressing portions 32 are connected to both ends thereof.
The pressing portion 32 is a flat gear member having a pressing portion side jig insertion hole 32a formed at the center, and has a structure in which a plurality of locking projections P2 are formed on the outer periphery of a substantially elliptical shape P1. Take.
In the present embodiment, the projection P2 is continuous with the first projections P21 and P21 that project in a substantially triangular shape from both ends of the major axis of the substantially elliptical shape P1, and the first projections P21 and P21. The second projections P22 and P22 projecting in a substantially triangular shape, and the third projections P23 and P23 projecting in a substantially triangular shape so as to be continuous with the second projections P22 and P22 are configured. Yes.
Assuming that the center point O of the substantially elliptical shape P1 is, the first protrusions P21 and P21, the second protrusions P22 and P22, and the third protrusions P23 and P23 are point-symmetric with respect to the center point O. Projected at the position.

In the present embodiment, the pressing portion 32 is formed on the basis of the substantially elliptical shape P1, but the present invention is not limited to this, and the distance between the wedge pieces 2 and 2 arranged facing each other is changed. Any shape can be used as long as it has a shape that makes contact with each other.
That is, in the present embodiment formed on the basis of the substantially elliptical shape P1, the short diameter (r1) and the longest diameter (r2) of the substantially elliptical shape P1 are disposed between the wedge pieces 2 and 2 arranged opposite to each other. (In other words, the distance between the opposing wedge pieces 2 and 2 can be expanded from the minor axis length of the substantially elliptical shape P1 to the major axis length). ).
Therefore, it is possible to basically use a figure having a major axis and a minor axis, such as a rhombus or a parallelogram, or a rectangular form in which the length of one side and a diagonal line is different (opposing the opposite sides). The distance between the wedge pieces 2 and 2 changes depending on whether the wedge pieces 2 and 2 are brought into contact with each other and when both diagonal pieces are brought into contact with the wedge pieces 2 and 2).
Moreover, the direction of a major axis (r2) and a minor axis (r1) changes with the press part 32 with the rotation.
That is, the major axis (r2) portion is gradually displaced from the direction perpendicular to the longitudinal direction of the cover member 1 toward the direction along the longitudinal direction of the cover member 1.
At this time, both ends of the major diameter (r2) portion of the pressing portion 32 are adjusted in the vertical direction (that is, in the direction perpendicular to the longitudinal direction of the cover member 1) so as not to collide with the inner wall of the cover member 1.
When there is a possibility that the inner wall of the cover member 1 and the pressing portion 32 come into contact with the rotation due to the positional relationship between the cover member 1 and the pressing portion 32, the size of the pressing member 32, or the like, between the pressing portions 32 and 32. The distance may be reduced. In this case, a cylindrical projection protruding in the inner wall direction of the cover member 1 is formed at the center of the pressing portion 32, and the pressing portion side jig insertion holes 32a and 32a are formed in the protruding portion. It is good to form.

The arrangement state of the cover member 1, the wedge piece 2, and the rotating member 3 configured as described above will be described with reference to FIGS. 1 to 3.
The rotating member 3 is disposed inside the cover member 1 so that the pressing portion side jig insertion holes 32 a and 32 a communicate with the cover side jig through holes 11 and 11 formed in the cover member 1.
And from both ends of the cover member 1, the butted side ends K1, K1 of the reinforcing bars K, K are respectively inserted.
And four wedge pieces 2 are interposed between the abutting side ends K1, K1 and the inner wall of the cover member 1.

The wedge piece 4 should be in the same use state as a normal wedge. That is, the wedge-side slope 23 is in contact with the abutting side end K1, the wedge-side bottom surface 21 is in contact with the inner wall of the cover member 1, and the side where the thickness is reduced is positioned in a direction away from the abutting side end K1. It is in a state of being press-fitted between the butt end K1 side and between the butt end K1 and the inner wall of the cover member 1 (denoted as “wedge insertion space M”).
At this time, the wedge side pressing surface 22 of the wedge piece 2 is in contact with or close to the short diameter portion of the pressing portion 32.

In addition, although this contact | abutting or proximity | contact part is mentioned later, it is suitable in arrangement | positioning if temporary fixing of the grade cut | disconnected by the initial force at the time of rotating the rotating member 3 with a hexagon wrench is performed.
As shown in FIGS. 1 to 3, the wedge pieces 2 configured in this way are arranged in a total of four pieces, two at each butting end K1.

FIG. 4 illustrates the function of the mechanical joint S according to the present embodiment.
As shown in FIG. 4A, in the initial installation state, the wedge side pressing surface 22 of the wedge piece 2 is in contact with or close to the short diameter portion of the pressing portion 32.
In this state, a hexagon wrench or the like is inserted into the communication hole between the cover side jig through hole 11 and the pressing portion side jig insertion hole 32a to rotate the pressing member 3.
At this time, since the diameter of the rotating member 3 is not constant as described above, the rotating member 3 presses the wedge-side pressing surfaces 22 on both sides with the rotation, and as a result, in FIGS. 4B and 4C. As shown, the four wedge pieces 2 bite into the wedge insertion space M, and the butted side ends K 1 and K 1 are fixed to the cover member 1.

That is, in FIG.4 (c), the wedge piece 2 will bite into the wedge insertion space M by the distance t1 (the distance between both butted side ends K1 and K1 widens by the distance of 2t1).
Therefore, the two reinforcing bars K and K are reliably joined together by the mechanical joint S.
As described above, according to the mechanical joint S according to the present embodiment, the abutting side ends K1, K1 of the reinforcing bars K, K can be simply and reliably joined only by rotating the rotating member 3 with a hexagon wrench. It becomes possible.

Further, at this time, since the first protrusions P21 and P21, the second protrusions P22 and P22, and the third protrusions P23 and P23 are formed on the rotating member 3, these portions are the wedges of the wedge piece 2. It becomes meshing with the side pressing surface 22, and the pressing efficiency can be improved.
In addition, this embodiment shows an example of specific application, and the shape, the number of formation, etc. of the first protrusions P21 and P21, the second protrusions P22 and P22, and the third protrusions P23 and P23 are as follows. The present invention is not limited to this, and any configuration may be used without departing from the spirit of the invention.

Next, a modified example will be described with reference to FIG.
In the example shown in FIG. 5A, two wedge pieces 2 and 2 arranged at one abutting side end K1 are connected to form a second wedge piece 102 at a position.
As a result, the second wedge piece 102 can be disposed at one abutting side end K1 by a single operation.
Moreover, as shown in FIG.5 (b), it is also possible to use the cup-shaped 3rd wedge piece 202. FIG.
At this time, the inner wall surface of the third wedge piece 202 can be provided on the slope, thereby providing a function as a wedge.
By comprising in this way, the 3rd wedge piece 202 can be arrange | positioned by one operation | work to one abutting side edge part K1.

DESCRIPTION OF SYMBOLS S Mechanical coupling 1 Cover member 11 Cover side jig | tool through-hole 2 Wedge piece 21 Wedge side bottom face 22 Wedge side press surface 23 Wedge side slope 3 Rotating member 31 Connecting rod part 32 Press part 32a Press part side jig insertion hole P1 Abbreviation Elliptical shape O Center point P2 Protrusion part P21 1st protrusion part P22 2nd protrusion part P23 3rd protrusion part K Reinforcing bar K1 Butting side edge part M Wedge insertion space 102 2nd wedge piece 202 3rd wedge piece

Claims (6)

It is a mechanical joint for joining the butt end portions of a plurality of reinforcing bars,
The mechanical joint is
A cover member that covers the abutting side ends of the plurality of reinforcing bars;
A wedge piece inserted into a wedge insertion space which is a gap formed between the inner wall of the cover member and the abutting side end;
A rotating member for pressing the wedge piece,
The plurality of wedge pieces are arranged at least one each between each of the butted side ends of a plurality of reinforcing bars and the inner wall of the cover member,
The rotating member includes a pressing portion disposed between the plurality of wedge pieces disposed between the abutting side end portions of a plurality of reinforcing bars and the inner wall of the cover member,
The pressing part is a flat plate member having a major axis and a minor axis,
The plurality of wedge pieces arranged between the abutting side end portions of a plurality of reinforcing bars and the inner wall of the cover member, and the pressing portion that is in contact with or close to the outer peripheral point of the short diameter portion is rotated. Thus, the pressing portion is in a direction in which the pressing portion is in press contact with the plurality of wedge pieces disposed between the abutting side end portions of the plurality of reinforcing bars and the inner wall of the cover member at the outer peripheral point of the long diameter portion. The pressing part can be displaced;
By the displacement, the distance between the plurality of wedge pieces arranged between the abutting side end portions of the plurality of reinforcing bars and the inner wall of the cover member is expanded by the pressing portion. Fittings. The rotating member includes a connecting rod portion that is a rod-shaped member, and two rotating members disposed at both ends of the connecting rod portion,
The rotating member is arranged to bridge the inner wall surface of the cover member, and the two pressing portions are configured to face the inner wall surface of the cover member,
2. The mechanical joint according to claim 1, wherein two wedge pieces are arranged so as to face the pressing portion with respect to one abutting side end portion. The cover member is formed with a cover side jig through hole,
The mechanical joint according to claim 1 or 2, wherein the pressing portion is formed with a pressing portion side jig insertion hole communicating with the cover side jig through hole.   The mechanical joint according to any one of claims 1 to 3, wherein at least one protrusion is formed on an outer peripheral portion of the pressing member.   The mechanical joint according to any one of claims 1 to 4, wherein the pressing member is a substantially elliptical flat plate. The mechanical joint according to claim 5, wherein the protrusion is formed on the outer peripheral portion of the pressing member at a position that is point-symmetric with respect to the center point.

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