JP4990834B2 - Sleeve rebar joint structure - Google Patents

Description

    The present invention relates to a sleeve-type reinforcing bar joint structure in which opposing reinforcing bars are integrated using a cylindrical member.

    The present applicant, in a sleeve-type reinforcing bar joint that uses a cylindrical member to connect the opposing reinforcing bars, makes it easy to install the reinforcing bar by making the cylindrical member a half member that is divided into two along the longitudinal direction, and The tip of the reinforcing bar can be a large bulging part, a protruding part can be formed from the inner peripheral wall of the cylindrical member, etc., thereby making it possible to increase the fixing force of the reinforcing bar, and as a result, the cylindrical member A sleeve-type reinforcing bar joint structure that provides a predetermined strength even when the length is shortened is proposed.

    However, since the halved member is used as described above, a fixing means for making the halved member into a cylindrical shape is necessary, and as a means for this, the applicant of the present invention disclosed in Japanese Patent Laid-Open No. 2006-124963. An embodiment of a fixing means in which a male screw is provided on the outer periphery of both end portions of a member, a ring having a female screw threadedly engaged with the male screw is prepared as a separate body, and both are integrated by screwing together. As proposed.

    However, the screwed connection by the male screw and the female screw has a play that becomes a small space between the screws, and the thin screw threads are locked to each other. Therefore, the initial contraction of the concrete inside and outside the cylindrical member. When a pulling force or the like is applied to the location due to a step or a subsequent vibration or the like, the screw thread may be damaged and the function of the screw may be lost.

When the screw thread is pulled outward, the tubular member is moved and deformed accordingly, and it has been feared that it is difficult to obtain a fixing means that is stable over a long period of time.
JP 2006-124963 A

    The present invention solves the above-mentioned drawbacks, and has a structure in which a cylindrical member is a half member, and the half member is integrated after mounting the reinforcing bar, and the reinforcing bar and the filler are fixed in the cylindrical member. A sleeve-type reinforcing bar joint structure in which the half members can be firmly integrated using the filler and the ring while the force is increased and the length of the cylindrical member is greatly shortened. Is to provide.

In a sleeve-type rebar joint structure in which a cylindrical member is divided into half members along the longitudinal direction, and the half members are arranged in the cylinder with the reinforcing bars arranged in the cylinder, the peripheral wall of the cylindrical member is filled. The material inlet and outlet are formed, and a ring is attached to the outer peripheral wall of both ends of the cylindrical member, the outlet is provided at a position where the ring is attached, and the reinforcing bars are arranged in a loose fit state. It is characterized by a sleeve-type reinforcing bar joint structure in which a filling material is filled into a space in the cylinder and the gap between the cylindrical member and the ring and they are integrated.

    The outer diameter of the cylindrical member is slightly smaller than the inner diameter of the ring, a gap is formed between the outer peripheral wall of the cylindrical member and the inner peripheral wall of the ring, and the sleeve is used as a filling space for the filler. Features a reinforced joint structure.

Further, the outer shape of the peripheral wall of the cylindrical member is characterized by a sleeve-type reinforcing bar joint structure formed such that the central portion in the longitudinal direction is thick and the left and right end portions are slightly thin .

Further, the left and right reinforcing bars arranged in the cylindrical member are characterized by a sleeve-type reinforcing bar joint structure in which the respective tips are bulged portions .

Furthermore, the diameter of both opening parts of the said cylindrical member is characterized by the sleeve type rebar joint structure made smaller than the diameter of the reinforcing bar tip bulge part .

Further, the present invention is characterized by a sleeve-type reinforcing bar joint structure in which an inlet is provided at the center in the longitudinal direction of the cylindrical member, outlets are provided at both end sides, and outlets are provided in rings to be mounted as necessary .

Further, the present invention is characterized by a sleeve-type reinforcing bar joint structure in which a gap between both ends of the attached ring and the cylindrical member is sealed with a sealing material .

    The sleeve-type reinforcing bar joint structure of the present invention is provided with a bulging part larger than the opening part at the tip part of the reinforcing bar and, if necessary, a locking part protruding in the reinforcing bar direction on the inner peripheral wall of the cylindrical member. For the filler formed between the inner wall of the member and the reinforcing bar and packed in the in-cylinder space, the bulging part, the locking part, etc. can be a strong anchor, which can greatly increase the fixing force of the left and right reinforcing bars It has become possible. This makes it possible to shorten the length of the cylindrical member.

    In addition to the above, since the rising portion is formed in the opening of the cylindrical member, the opening can be made small, the sealing material disposed between the reinforcing bars can be reduced, and at the same time, the outside of the filler It is possible to reduce the risk of spilling into the water and to make the anchor effect of the filler more effective.

    Further, since the cylindrical member is a half member, it is easy to install a reinforcing bar, and as a means for maintaining the half member as a cylindrical member, a ring is attached from both ends thereof, and the outer peripheral wall of the cylindrical member and the The ring is firmly fixed by filling the gap with the inner peripheral wall of the ring. As a result, the initial fixed state is maintained even if a load is applied to the cylindrical member due to shrinkage or vibration of the concrete. It became possible to do.

    Hereinafter, the present invention will be described based on the best embodiments.

    FIG. 1 is a front sectional view of a sleeve-type reinforcing bar joint structure according to the present invention. The sleeve-type reinforcing bar joint structure includes a sleeve-type reinforcing bar joint (hereinafter referred to as a tubular member) 1, left and right reinforcing bars 2, and left and right rings 3. In addition, a space portion in the tubular member and a filler 4 filled in a gap between the tubular member and the ring are configured.

    The cylindrical member 1 includes a peripheral wall 5 forming inner and outer side walls of a cylindrical shape forming a sleeve body, left and right openings 6, a locking part 7 protruding from the inner peripheral wall of the peripheral wall 5, and an inlet of the opening 6 And a rising portion 8 formed so as to narrow.

    Further, as shown in FIG. 1, the outer shape of the peripheral wall 5 of the cylindrical member 1 is formed such that the central portion in the longitudinal direction is thick and the left and right end portions are slightly thin, and is divided into two along the longitudinal direction. It is made into a half member so that it may be.

    The slightly thinned both ends have an outer diameter H1 that allows the ring 3 to be attached to the outer peripheral wall.

    The cylindrical member 1 is surrounded by an inner peripheral wall 5 of a cylindrical peripheral wall 5 to form a space portion 9, and a reinforcing bar connected to the space portion 9 from the left and right openings 6 in the form of a half member. 2 is arranged. As the rebar 2, a normal round steel rebar or a deformed rebar is used. A bulging portion 10 for an anchor is formed at the end of the reinforcing bar 2. The bulging portion 10 forms a large bump-shaped bulging portion 10 at the end portion by crushing the end portion of the reinforcing bar 2 while applying heat with a gas burner from the axial direction or by friction welding.

As an example, if the diameter of the reinforcing bar 2 arranged on the half member is D, the diameter of the bulging portion 10 is about 1.4D. The protruding length of the bulging portion 10 is about 0.65D.
Moreover, the opening diameter D1 of both the opening parts 6 of the cylindrical member 1 which arrange | positions the said reinforcement 2 shall be about 1.2-1.3D, and is formed smaller than the diameter of the bulging part 10 of the reinforcement 2. FIG. By using a half member, the diameter of the bulging portion 10 can be made larger than the opening diameter of the opening 6.

    Furthermore, on both end sides which are the inner peripheral walls of the peripheral wall 5, a locking portion 7 is formed so as to protrude in the direction of the reinforcing bar as necessary, or / and an uneven portion is formed, and the filler 4 filled in the space portion 9 The locking force is increased so that the fixed state is good.

    Further, the rising portion 8 formed on the inner peripheral wall serving as both edge portions of the peripheral wall 5 makes the opening diameter of the opening 6 smaller than the diameter of the bulging portion 10 of the reinforcing bar 2 as described above, and at the same time the rising portion 8. By forming the rising surface on the inner side with a sharp angle, the stay of the filler 4 in the space 9 and the locking force thereof can be improved.

    Further, the distance between the inner peripheral wall 5 of the peripheral wall 5 of the space portion 9 filled with the filler and the outer peripheral portion of the bulging portion 10 takes into account the spread of the filler. At least about 1.5 mm or more is necessary.

The length D3 of the reinforcing bar 2 arranged in the sleeve-type reinforcing bar joint 1 can be about 2 to 2.5D.
The distance D4 between the tips of the reinforcing bar 2 arranged on the one opening 6 side and the reinforcing bar 2 arranged on the other opening 6 side is about 5 to 30 mm.
Accordingly, the total length of the sleeve-type reinforcing bar joint 1 may be about 4 to 6D, although it varies somewhat depending on the diameter of the reinforcing bar.

    In addition, an inlet 11 for filling the space portion 9 with the filler 4 is formed in the peripheral wall 5. In the first embodiment, it is provided at the center of the cylindrical member 1. The filler injected from the injection port 11 flows out from the outlet 12 formed on the end side where the left and right rings 3 of the peripheral wall 5 on the opposite side are disposed. The outlet 12 can reinforce a defect caused by a through hole by selecting a portion formed by thickly forming the peripheral wall 5 serving also as the locking portion 7.

    As the filler 4, various mortars are used, but those with early strong mortar and especially expanded cement are most suitable.

    As shown in FIG. 2, the ring 3 has a cylindrical shape in which openings 13 are formed at both ends. From the one opening 13 side to each end where the half member is a cylindrical member 1. Installing. It is attached to the left and right reinforcing bars 2 in advance, and the cylindrical member 1 is moved after being formed.

    The cylindrical member 1 can be mounted by making the inner diameter H2 of the ring 3 slightly larger than the outer diameter H1 that forms the outer peripheral wall on the opening 6 side of the cylindrical member 1. For example, when the outer diameter H1 of the cylindrical member 1 is 60 mm, the inner diameter H2 of the ring 3 is about 64 mm.

    As shown in FIG. 3, a slight gap W is generated between the outer peripheral wall of the peripheral wall 5 after the ring 3 is attached to the tubular member 1 and the inner peripheral wall of the ring 3. According to the above example, the gap W of about 2 mm is generated around the periphery.

    Each reinforcing bar 2 is arranged on one half member of the tubular member 1 and a tubular body is completed with the other half member so as to cover it. The ring 3 is moved from the part and attached. After the mounting, the filler 4 such as mortar is injected from the injection port 11.

    Prior to injection, the gap between the opening 6 and the reinforcing bar 2 is closed with a ring-shaped rubber material or other sealing material 14. Since the rising portion 8 is formed high, the opening diameter is small, and the sealing material 14 is easy to enclose, is not loaded, and is difficult to come off. Small parts are also required. The in-cylinder space 9 is closed by the sealing material 14, and the filler 4 does not flow out of the opening 6. Further, the gap between the outer peripheral wall of the peripheral wall 5 and the inner peripheral wall of the ring 3 is closed with a ring-shaped rubber material or other sealing material 14 '. A gap W between the outer peripheral wall of the peripheral wall 5 and the inner peripheral wall of the ring 3 is closed by the sealing material 14 ′. As shown by the arrow in FIG. 3, the filler 4 filled in the space 9 from the inlet 11 flows out from the outlet 12 provided in the sleeve-type reinforcing bar joint 1.

    Since the entire outer peripheral wall side of the outlet 12 is covered with the ring 3, the outflowing filler 4 fills the gap W between the outer peripheral wall of the peripheral wall 5 and the inner peripheral wall of the ring 3. It flows out from the outlet 15 provided on the upper surface.

    When the outflow phenomenon from the outlet 15 of the ring 3 occurs, the filling of the filler from the inlet 11 is stopped.

    When the filler 4 is cured by this injection construction, the reinforcing bar 2 is firmly fixed in the cylindrical member 1 and the filler 4 filled in the gap W between the outer peripheral wall of the cylindrical member 1 and the inner peripheral wall of the ring 3 is filled. The halved member that has been divided into two parts is a joint of a strong cylindrical body integrated as the cylindrical member 1.

    Since the ring 3 is fixed by the filler filled in the gap W, even if various forces are applied to the sleeve-type reinforcing bar joint due to a pulling force, a shrinking force, a subsequent vibration, an earthquake, or the like accompanying the hardening of the concrete, the cylinder The fixing force as a solid body is strong, and a stable fixing means can be obtained.

In addition, the movement prevention of the ring at the time of filling the filler 4 or the like can be appropriately performed by driving a wedge symmetrically with respect to the gap from the end side or applying a contact plate or the like from the end side. .
In the above embodiment, the bulging portion 10 for the anchor is formed at the end of the reinforcing bar 2, but a reinforcing bar that does not form the bulging portion may be used.

    In the second embodiment (not shown), as a means for preventing the halved members of the first embodiment from opening each other, the halved member is placed at an appropriate position along the longitudinal direction at the contact position of the halved member. A flange projecting in the direction is provided, and between the two flanges formed on the half member is tightened with bolts and nuts to prevent the half member from opening.

    Since the pulling force or the like acts in the longitudinal direction of the cylindrical member, there is little influence on the bolt and nut in the orthogonal direction, and it is effective as a connection between the half members. You may use together with the said Example 1, and this may be sufficient.

The front sectional view of the sleeve type reinforcing bar joint structure of the present invention. The front sectional view of the ring of the sleeve type reinforcing bar joint structure of the present invention. FIG. 3 is a partially omitted front cross-sectional view showing a state in which a ring is mounted on a joint of the sleeve type reinforcing bar joint structure of the present invention.

Explanation of symbols

1 Sleeve type rebar joint (tubular member)
2 Reinforcing bar 3 Ring 4 Filler 5 Circumferential wall
6 opening
7 Locking part
8 rising portion 9 space portion 10 bulging portion 11 inlet 12 outlet 13 opening
14 Sealing material
14 'sealant
15 Outlet

Claims (8)

In a sleeve-type rebar joint structure in which a cylindrical member is divided into half members along the longitudinal direction, and the half members are arranged in the cylinder with the reinforcing bars arranged in the cylinder, the peripheral wall of the cylindrical member is filled. The material inlet and outlet are formed, and a ring is attached to the outer peripheral wall of both ends of the cylindrical member, the outlet is provided at a position where the ring is attached, and the reinforcing bars are arranged in a loose fit state A sleeve-type reinforcing bar joint structure, wherein a filling material is filled in an in-cylinder space and a gap between the tubular member and the ring, and these are integrated.   The outer diameter of the cylindrical member is slightly smaller than the inner diameter of the ring, and a gap is formed between the outer peripheral wall of the cylindrical member and the inner peripheral wall of the ring, and the gap serves as a filling space for the filler. The sleeve type reinforcing bar joint structure according to claim 1. The sleeve-type reinforcing bar joint structure according to claim 1 or 2, wherein the outer shape of the peripheral wall of the cylindrical member is formed such that a central portion in the longitudinal direction is thick and both left and right end portions are slightly thin . The sleeve-type reinforcing bar joint structure according to any one of claims 1 to 3, wherein the left and right reinforcing bars arranged in the cylindrical member have bulged portions at their respective ends. The sleeve-type reinforcing bar joint structure according to any one of claims 1 to 4, wherein the diameter of both openings of the cylindrical member is smaller than the diameter of the reinforcing bar tip bulge . The sleeve-type reinforcing bar joint structure according to any one of claims 1 to 5, wherein an injection port is provided at a central portion in the longitudinal direction of the cylindrical member, and an outlet is provided at both ends . Sleeve-type reinforcing bar joint structure according to any one of claims 1 to 6, characterized in that a outlet to the ring to be mounted. The sleeve-type reinforcing bar joint structure according to any one of claims 1 to 7, wherein a sealant seals between both ends of the ring to be mounted and the cylindrical member .

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