Attachment cut cover for Anti-sway reinforcing-bar and earthquake-resistant slit structure using the same

Abstract

To easily cover anti-sway reinforcing bars, accommodating variations in their lengths, in an earthquake-resistant slit between a column or a beam and a wall of a concrete structure.SOLUTION: Provided is a cylindrical anti-sway reinforcing bar attachment cut cover 1 for covering an anti-sway reinforcing bar 3 connecting a column 2a, a beam 2b, or a base 2c and a wall 2d of a concrete structure 2 through an earthquake-resistant slit member 2e, wherein, after mounting the anti-sway reinforcing bar 3, a base-end non-bellows cylindrical part 11 covering the base-end of the anti-sway reinforcing bar 3, a tip-end non-bellows cylindrical part 12 covering the tip-end of the anti-sway reinforcing bar 3 after mounting the anti-sway reinforcing bar 3, and a bellows cylindrical part 13, located between the base-end non-bellows cylindrical part 11 and the tip-end non-bellows cylindrical part 12, is expandable and contractible by bellows folding processing to cover between the base end and the tip end of the anti-sway reinforcing bar 3.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an anti-sway rebar attachment cutter cover that is attached to an anti-sway rebar that is installed to pass through an earthquake-resistant slit between a wall and a structural frame such as a column, foundation, or beam of a concrete structure, and to an earthquake-resistant slit structure that uses the anti-sway rebar attachment cutter cover. [Background technology]

[0002] In earthquake-resistant slit structures in which earthquake-resistant slits are provided at the boundaries between structural members, such as the joints of columns and beams in concrete buildings, anti-vibration rebars are provided in the earthquake-resistant slits to connect the structural framework, such as columns, foundations, and beams, to the wall body to prevent deformation outside the structural plane due to horizontal shaking caused by earthquakes, etc., and a technology has been proposed in which slit buffer material (earthquake-resistant slit material) is interposed in the earthquake-resistant slits to prevent the anti-vibration rebars from breaking due to in-plane (wall) shaking during an earthquake and damaging the concrete building, and cushioning material is attached to the rebar anchors (anti-vibration rebars) and a flexible film is covered on the rebar anchors (anti-vibration rebars) to form earthquake-resistant reinforcement sections (see, for example, Patent Document 1).

[0003] According to the technology of Patent Document 1, the reinforcing bar anchor (anti-vibration reinforcing bar) has a shock-absorbing effect due to the slit buffer material (earthquake-resistant slit material) and cushioning material, and the flexible film makes it easier for the contact surface between the concrete and the reinforcing bar anchor (anti-vibration reinforcing bar) to slide, thereby preventing damage to the columns, beams, foundations, walls, etc. of reinforced concrete buildings. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2003-321946 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, in actual construction sites, the spacing of earthquake-resistant slits and the length of reinforcing bar anchors (anti-vibration bars) vary depending on the concrete building, so the technology in Patent Document 1 mentioned above requires cushioning material to be prepared according to the conditions of those reinforcing bar anchors (anti-vibration bars), which creates a problem of heavy workload.

[0006] Furthermore, the earthquake-resistant architectural structure described in the above-mentioned Patent Document 1 requires flexible films and protective caps in addition to the cushioning material, which increases the number of components.

[0007] Therefore, in consideration of such problems, the present invention aims to provide a vibration-prevention rebar attachment cut cover that can easily accommodate cases where the lengths of the vibration-prevention rebars installed in the earthquake-resistant slits between the columns or beams and walls of a concrete structure are different, and an earthquake-resistant slit structure using the same. [Means for solving the problem]

[0008] In order to solve the above problems, the attachment cut cover for anti-vibration rebar of the present invention is a tubular anti-vibration rebar attachment cut cover that covers the anti-vibration rebar that connects the columns, beams or foundation of a concrete structure to a wall via an earthquake-resistant slit material, and is characterized by having a bellows tubular portion that expands and contracts by bellows folding processing to cover all or part of the anti-vibration rebar. In addition, the attachment cutter cover for anti-sway rebar according to the present invention is characterized in that a non-bellows tubular portion that is not bellows-folded is provided on both longitudinal sides of the bellows tubular portion, and a pleated valve piece is provided on the inner surface of the non-bellows tubular portion that becomes the base end side of the anti-sway rebar when attached to the anti-sway rebar, and a hole smaller than the outer diameter of the anti-sway rebar is formed in the center of the valve piece. Furthermore, the attachment cutter cover for anti-vibration rebar according to the present invention is characterized in that a non-bellows tubular portion that is not bellows-folded is provided on both longitudinal sides of the bellows tubular portion, and a flange portion extending toward the outside of the non-bellows tubular portion is provided at the tip of the non-bellows tubular portion, which becomes the base end of the anti-vibration rebar when attached to the anti-vibration rebar. Furthermore, in the attachment cutter cover for anti-vibration rebar according to the present invention, a non-bellows tubular section that is not bellows-folded is provided on both longitudinal sides of the bellows tubular section, and each of the non-bellows tubular sections on both sides is characterized in that it is provided with a connecting section that protrudes from the inner surface side toward the outer surface side or the opposite direction. In addition, the earthquake-resistant slit structure of the concrete structure of the present invention is characterized in that when any one of the above-mentioned anti-sway rebar attachment cut covers is attached to the anti-sway rebar, the bellows tube portion is extended to cover the entire anti-sway rebar, and the cover is attached so as to form a hollow portion between the end of the anti-sway rebar attachment cut cover and the end of the anti-sway rebar, which becomes an area in which the anti-sway rebar can move in the event of an earthquake. Effect of the Invention

[0009] According to the attachment cut cover for anti-vibration rebars of the present invention, when the lengths of the anti-vibration rebars are different, the bellows tubular portion can be expanded or contracted to accommodate different lengths, making it possible to accommodate multiple sizes with one size without having to increase the size of the attachment cut cover for anti-vibration rebars. [Brief description of the drawings]

[0010] [Figure 1] 1 is a diagram showing the installation location of a sway-stop rebar to which an attachment cutter cover for a sway-stop rebar according to an embodiment of the present invention is attached. FIG. [Diagram 2] 1A to 1D are respectively a front view of the anti-sway rebar attachment cutter cover in a contracted state of the first embodiment of the present invention, a front view with an end cut-out in an extended state, a left side view, and a right side view. [Diagram 3] 1A and 1B are enlarged cross-sectional views of the base end non-corrugated tubular portion and the bellows tubular portion of the anti-sway bar attachment cutter cover of the first embodiment of the present invention, and the tip end non-corrugated tubular portion and the bellows tubular portion, respectively. [Figure 4] 1(a) to 1(c) are explanatory views showing a procedure for attaching the attachment cutter cover for a sway-proof rebar according to the first embodiment of the present invention. [Diagram 5] FIG. 4(c) is an enlarged view of part A in FIG. [Figure 6] FIG. 4(c) is an enlarged view of part B in FIG. [Figure 7] 13A and 13B are cross-sectional views of the essential parts of the base end non-corrugated tubular part and the tip end non-corrugated tubular part of the anti-vibration rebar attachment-cutting cover of the second embodiment of the present invention, respectively. [Figure 8] 1A and 1B are partial front views showing the state before connecting an attachment cut cover for anti-sway rebars of embodiment 2 of the present invention to another attachment cut cover for anti-sway rebars, and the state after connection, respectively. [Figure 9] 11 is a cross-sectional view of a main portion of a tip cap constituting an attachment cutter cover for a sway-proof rebar according to a third embodiment of the present invention. FIG. [Figure 10] 13A and 13B are diagrams showing the state of the attachment cutter cover for anti-vibration rebar of embodiment 3 before the end cap is attached, and the state after the end cap is attached, respectively. [Figure 11] FIG. 11 is a cross-sectional view showing another configuration example of the end cap that constitutes the anti-sway rebar attachment cutter cover of embodiment 3 of the present invention, and a cross-sectional view of the key parts of the non-corrugated tubular portion on the end side of the anti-sway rebar attachment cutter cover that corresponds to the end cap of the other configuration example. [Figure 12] 13A and 13B are a cross-sectional view and a left side view, respectively, of a main part of a base end side non-bellows tubular part of an attachment-cutting cover for anti-vibration rebar according to a fourth embodiment of the present invention. [Figure 13] (a) and (b) are cross-sectional views of key parts showing the state when a sway-stop rebar is inserted into the base-end non-corrugated tubular portion of the attachment cut-off cover for sway-stop rebar of embodiment 4 of the present invention, and cross-sectional views of key parts showing the state of the base-end non-corrugated tubular portion when the sway-stop rebar is completely covered by the attachment cut-off cover for sway-stop rebar of embodiment 4. [Figure 14] 13A and 13B are respectively a cross-sectional view of the essential parts of the base end side non-corrugated tubular portion of another configuration example of the attachment cutter cover for anti-vibration rebar of this embodiment 4, and a left side view of the base end side non-corrugated tubular portion of yet another configuration example. [Figure 15] 13A to 13C are a front view, a cross-sectional view of a main portion, and a left side view, respectively, of a non-corrugated tubular portion and a bellows tubular portion on the base end side of the attachment-cut cover for anti-sway rebar of this embodiment 5. [Figure 16] 13A and 13B are diagrams showing other configurations of the attachment cutter cover for anti-vibration rebar of embodiment 5, respectively showing the state before the base end cap having a flange portion is attached and the state after the base end cap is attached. [Figure 17] 6(a) and 6(b) are cross-sectional views of key parts of the non-corrugated tubular portion and the bellows tubular portion at the tip side of the attachment-cutting cover for anti-sway rebar of embodiment 6 of the present invention, and cross-sectional views of key parts showing the state of the non-corrugated tubular portion and the bellows tubular portion at the tip side when the anti-sway rebar is completely covered by the attachment-cutting cover for anti-sway rebar of embodiment 5. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the anti-vibration rebar attachment cut covers 1A to 1F of the first to sixth embodiments of the present invention and the earthquake-resistant slit structure using them will be described. Note that the anti-vibration rebar attachment cut covers 1A to 1F of the first to sixth embodiments of the present invention described below are merely examples of the present invention, and the present invention is not limited to the anti-vibration rebar attachment cut covers 1A to 1F of the first to sixth embodiments described below, and can be modified as appropriate within the scope of the invention's technical concept.

[0012] The attachment cut-off covers 1A to 1F for anti-vibration rebars in the first to sixth embodiments of the present invention are cylindrical members that are inserted through and cover the anti-vibration rebars 3 that connect the columns 2a, beams 2b or foundations 2c of the concrete structure 2 to the wall 2d via earthquake-resistant slit materials 2e as shown in FIG. 1, and are members that prevent the concrete that constructs the wall 2d from coming into contact with the anti-vibration rebars 3, and are made of materials such as polyvinyl chloride resin, fluororesin, synthetic resins such as polypropylene, and rubber.

[0013] Embodiment 1. <Configuration of the attachment cut cover 1A for anti-vibration rebar according to embodiment 1> The attachment cutter cover 1A for anti-sway rebar of embodiment 1 of the present invention is a tubular member which, as described above, is placed over the anti-sway rebar 3 by passing the anti-sway rebar 3 through it, and when attached to the anti-sway rebar 3 as shown in Figure 4(d) described below, is configured to include a non-bellows tubular portion 11 (hereinafter referred to as the base end non-bellows tubular portion) located at the base end of the anti-sway rebar 3, a non-bellows tubular portion (hereinafter referred to as the tip side non-bellows tubular portion) 12 located at the tip side of the anti-sway rebar 3, and a bellows tubular portion 13 which is provided between the base end non-bellows tubular portion 11 and the tip side non-bellows tubular portion 12 as shown in Figures 2(a) and (b), etc., and which expands and contracts by bellows folding processing to cover the anti-sway rebar 3.

[0014] (Base end non-bellows tube portion 11) The base-end non-corrugated tubular portion 11 is also the portion into which the tip of the anti-sway bar 3 is first inserted when attaching it to the anti-sway bar 3, and as shown in Figure 3(a), the inner diameter r1 of the opening 11a is configured to be larger than the outer diameter R0 of the anti-sway bar 3 being used.

[0015] (Tip side non-bellows tube portion 12) The tip-side non-bellows tubular portion 12 is a portion provided on the opposite side of the base-side non-bellows tubular portion 11 via the bellows tubular portion 13, and is the portion where the tip of the anti-sway bar 3 is located when attached to the anti-sway bar 3, and this tip portion is provided with a blocking portion 12a that blocks the tip as shown in Figures 2(d) and 3(b).

[0016] The inner diameter r2 of the tip-side non-bellows tubular portion 12 is also configured to be larger than the outer diameter R0 of the anti-vibration rebar 3, and is the same as the inner diameter r1 of the base-side non-bellows tubular portion 11 in the first embodiment.

[0017] (Bellows tube part 13) The bellows tubular portion 13 is provided between the base end non-bellows tubular portion 11 and the tip end non-bellows tubular portion 12, and is configured to be expandable and contractible by bellows folding processing. It is configured in a tubular shape that communicates with the base end non-bellows tubular portion 11 and the tip end non-bellows tubular portion 12 to allow the anti-sway rebar 3 to pass through, and is used by expanding and contracting according to the length of the anti-sway rebar 3 to cover almost the entire anti-sway rebar 3.

[0018] Therefore, the minimum inner diameter of the bellows tubular portion 13 when contracted, i.e., the inner diameter r1' of the inwardly folded portion when contracted (see Figure 3(a)), is greater than or equal to the outer diameter R0 of the anti-vibration bar 3 used, and is equal to or greater than the inner diameter r1 of the base end non-bellows tubular portion 11 and the inner diameter r2 of the tip end non-bellows tubular portion 12.

[0019] <Method of using the attachment cutter cover 1A for anti-vibration rebar according to embodiment 1> Next, a method of using the thus configured anti-vibration rebar attachment-cutting cover 1A of the first embodiment will be described.

[0020] 4(a) to (c) are explanatory diagrams showing the procedure for attaching the attachment-cutting cover 1A for a vibration-preventing rebar according to the first embodiment of the present invention.

[0021] First, when attaching the anti-sway rebar attachment cut cover 1 to the anti-sway rebar 3 that connects the base 2c and wall 2d of the concrete structure 2 via the earthquake-resistant slit material 2e, first, as shown in Fig. 4(a), the base end side of the anti-sway rebar 3 is embedded in the base 2c, and the non-bellows tube part 11 on the base end side of the anti-sway rebar attachment cut cover 1A is attached to the tip of the anti-sway rebar 3 protruding from the earthquake-resistant slit material 2e. The state shown in Fig. 4(a) is the state before pouring the concrete that will construct the wall 2d.

[0022] Next, as shown in Figure 4(b), while extending the bellows tube portion 13 of the attachment cut cover 1A for the anti-sway rebar, the base end side non-bellows tube portion 11 is lowered toward the base end of the anti-sway rebar 3, i.e., the earthquake-resistant slit material 2e, and finally, as shown in Figure 4(c) and Figure 5 which shows an enlarged view of portion A, which is the base end of the anti-sway rebar 3, the bellows tube portion 13 is extended until the tip of the base end side non-bellows tube portion 11 abuts the surface of the earthquake-resistant slit material 2e, and the outside of the anti-sway rebar 3 protruding from the earthquake-resistant slit material 2e is covered with the attachment cut cover 1 for the anti-sway rebar.

[0023] In this case, the tip of the anti-sway rebar 3 is attached so that a hollow section S, which is a movable area of ​​the anti-sway rebar 3 during an earthquake, is generated between the tip of the anti-sway rebar 3 and the closing section 12a of the closing section 12a of the closing section 12a of the non-corrugated tube section 12 of the attachment cut cover 1A for anti-sway rebar, as shown in Fig. 6, which is an enlarged view of part B of Fig. 4(c). As a result, even if the anti-sway rebar 3 moves relatively to the wall 2d in its longitudinal direction during an earthquake, the tip of the anti-sway rebar 3 moves within the hollow section S of the non-corrugated tube section 12 of the attachment cut cover 1A for anti-sway rebar and does not come into contact with the closing section 12a, so that the tip of the anti-sway rebar 3 does not come into contact with the concrete wall 2d and destroy the wall 2d or cause cracks.

[0024] Thereafter, concrete for constructing the wall 2d is poured between the formwork from above the anti-vibration rebar attachment cut cover 1A, and the wall 2d is constructed.

[0025] Therefore, according to the attachment cut cover 1A for anti-sway rebar of embodiment 1 and the earthquake-resistant slit structure using it, even if the length of the anti-sway rebar 3 protruding from the earthquake-resistant slit material 2e varies from site to site, the length of the attachment cut cover 1A for anti-sway rebar can be adjusted by expanding and contracting the bellows tube portion 13 to cover the entire anti-sway rebar 3, so that anti-sway rebars 3 of different lengths can be easily accommodated.

[0026] Furthermore, in the attachment cut cover 1A for anti-sway rebar in embodiment 1, a blocking portion 12a is provided at the tip of the tip side non-corrugated tubular portion 12 where the tip side of the anti-sway rebar 3 is located, so that it is possible to reliably prevent the infiltration of concrete sludge from the tip of the attachment cut cover 1 for anti-sway rebar.

[0027] Furthermore, in the case of embodiment 1, when the attachment cut cover 1 for the anti-sway rebar is attached to the anti-sway rebar 3, as shown in Figure 6, a hollow section S for the movement area of ​​the anti-sway rebar 3 is secured between the tip of the anti-sway rebar 3 and the blocking section 12a of the attachment cut cover 1A for the anti-sway rebar. Therefore, even if the anti-sway rebar 3 moves relative to the wall 2d in its longitudinal direction during an earthquake, it is possible to reliably prevent the tip of the anti-sway rebar 3 from abutting the concrete wall 2d and destroying or cracking the wall 2d.

[0028] In the embodiment 1, the attachment cutter cover 1A for the anti-vibration rebar is described as being provided with the base end non-bellows tubular portion 11 and the tip end non-bellows tubular portion 12, which are not bellows processed, on both sides of the bellows tubular portion 13, but the present invention is not limited to this, and it is of course possible to omit the base end non-bellows tubular portion 11 and the tip end non-bellows tubular portion 12 and configure only the bellows tubular portion 13 to cover the entire anti-vibration rebar 3. In this case, if a blocking portion is provided at the tip of the bellows tubular portion 13 similar to the blocking portion 12a of the tip end non-bellows tubular portion 12, it is possible to prevent concrete slag from entering from the tip of the bellows tubular portion 13.

[0029] Embodiment 2. The attachment cutter cover 1A for anti-vibration rebar in the above-mentioned embodiment 1 covers the entire anti-vibration rebar 3 by extending the bellows tube portion 13, but it cannot be used in the case of an anti-vibration rebar 3 having a length that cannot be accommodated even when the bellows tube portion 13 is extended to its maximum extent.

[0030] Therefore, in the case of the attachment cut cover 1B for anti-sway rebar in embodiment 2, in the case of an anti-sway rebar 3 having a length that cannot be accommodated even by extending the bellows tube portion 13, the attachment cut covers 1B for anti-sway rebar are configured to be connected to each other to accommodate the anti-sway rebar.

[0031] 7(a) and (b) are cross-sectional views of essential parts such as the base end non-corrugated tubular portion 11 and the tip end non-corrugated tubular portion 12 of the anti-vibration rebar attachment-cutting cover 1B of embodiment 2 in a contracted state.

[0032] 7(a) and (b), in the attachment cut cover 1B for anti-vibration rebar of the second embodiment, the base end non-bellows tubular part 11 and the tip end non-bellows tubular part 12 are provided with annular connecting parts 11b and 12b that protrude from the inner peripheral surface side toward the outer peripheral surface side. The configuration of the bellows tubular part 13 is the same as that of the attachment cut cover 1A for anti-vibration rebar of the first embodiment.

[0033] Furthermore, in the attachment-cutting cover 1B for anti-sway rebars of embodiment 2, the attachment-cutting covers 1B for anti-sway rebars are connected to each other, that is, the base-end non-corrugated tubular portion 11 of one attachment-cutting cover 1B for anti-sway rebars is connected to the tip-end non-corrugated tubular portion 12 of another attachment-cutting cover 1B for anti-sway rebars, so that, for example, the inner diameter r1 of the base-end non-corrugated tubular portion 11 (see Figure 7(a)) is configured to be approximately equal to the outer diameter R2 of the tip-end non-corrugated tubular portion 12 (see Figure 7(b)), and the opening 12c of the tip-end non-corrugated tubular portion 12 can be inserted into the opening 11a of the base-end non-corrugated tubular portion 11. Furthermore, on the other hand, the outer diameter of the base end non-bellows tubular portion 11 may be configured to be approximately equal to the inner diameter of the tip end non-bellows tubular portion 12 so that the opening 11a of the base end non-bellows tubular portion 11 can be inserted into the opening 12c of the tip end non-bellows tubular portion 12.

[0034] Furthermore, in the case of the attachment cut cover 1B for anti-sway rebars in embodiment 2, since it is assumed that the cover will be used in a connected state, unlike the attachment cut cover 1A for anti-sway rebars in embodiment 1, the non-corrugated tubular portion 12 at the tip side does not have a blocking portion 12a, but instead has an opening 12c.

[0035] Therefore, in the case of a sway-stop rebar 3 having a length that cannot be accommodated even by extending the bellows tube portion 13, the opening 12c side of the tip-end non-bellows tube portion 12 of one sway-stop rebar attachment-cutting cover 1B is inserted into the opening 11a of the base-end non-bellows tube portion 11 of the other sway-stop rebar attachment-cutting cover 1B and connected, as shown in Figure 8(a).

[0036] Then, at this connection part, the annular connecting portion 11b of the base end non-corrugated tubular portion 11 of the anti-sway bar attachment cutter cover 1B, which is on the inner side, fits into the annular connecting portion 12b of the tip end non-corrugated tubular portion 12, which is on the outer side, as shown in Figure 8(b), and the connection can be made in a state where it is difficult to come loose.

[0037] Therefore, according to the attachment cut cover 1B for anti-vibration rebars of the second embodiment and the earthquake-resistant slit structure using it, like the attachment cut cover 1A for anti-vibration rebars of the first embodiment, it is possible to cover the anti-vibration rebars 3 according to their length by stretching the bellows tube portion 13, and when it is not possible to cover the entire anti-vibration rebars 3 by stretching the bellows tube portion 13, it is possible to cope with this by connecting the attachment cut covers 1B for anti-vibration rebars to each other by the annular connecting portions 11b, 12b. As a result, it is possible to easily cope with anti-vibration rebars 3 of different lengths, and usability can be further improved.

[0038] In the description of the second embodiment, the base end non-bellows tubular portion 11 and the tip end non-bellows tubular portion 12 are provided with the annular connecting portions 11b, 12b that protrude from the inner peripheral surface side toward the outer peripheral surface side, but the present invention is not limited to this, and it is of course possible to provide an annular connecting portion that protrudes from the opposite direction, that is, from the outer peripheral surface side toward the inner peripheral surface side, and any connecting portion that can connect the base end non-bellows tubular portion 11 and the tip end non-bellows tubular portion 12 can be used even if it is not an annular connecting portion. The same is also true for various annular connecting portions that will be described in the following embodiments.

[0039] Embodiment 3. The attachment cut cover 1B for the anti-vibration rebar in the above-mentioned embodiment 2 is configured so that the attachment cut covers 1B for the anti-vibration rebar can be connected to each other and used, and therefore, unlike the attachment cut cover 1A for the anti-vibration rebar in the embodiment 1, the blocking portion 12a is not provided in the tip-side non-bellows tube portion 12. Therefore, when the attachment cut cover 1B for the anti-vibration rebar is connected to the anti-vibration rebar 3 and covered, and concrete for constructing the wall 2d is poured, concrete sludge may enter from the tip of the tip-side non-bellows tube portion 12 and enter the gap between the attachment cut cover 1B for the anti-vibration rebar and the anti-vibration rebar 3, and the anti-vibration rebar 3 and the wall 2d, etc. may be joined, and it may be difficult to exert the attachment cut function of the attachment cut cover 1B for the anti-vibration rebar.

[0040] Therefore, the attachment cut cover 1C for anti-sway rebar in the third embodiment is characterized in that it is configured so that the opening 12c at the tip of the tip-side non-bellows tubular portion 12 of the attachment cut cover 1B for anti-sway rebar in the second embodiment can be closed by attaching tip caps 14, 14', which are separate from the attachment cut cover 1B for anti-sway rebar, to the opening 12c at the tip of the tip-side non-bellows tubular portion 12. Note that the configuration of the attachment cut cover 1B for anti-sway rebar in the second embodiment has already been explained, so the explanation will be omitted and the configuration of the tip caps 14, 14' will be explained.

[0041] FIG. 9 is a cross-sectional view of a main part of a tip cap 14 constituting a vibration-prevention rebar attachment-cutting cover 1C of the third embodiment.

[0042] As shown in Figure 9, the tip cap 14 that constitutes the anti-sway rebar attachment cutter cover 1C of embodiment 3 has an opening 14a at one end while the other end is closed.In order to be attached to the tip non-corrugated tubular portion 12 of the anti-sway rebar attachment cutter cover 1B of embodiment 2, its inner diameter r3 is made approximately the same as or slightly larger than the outer diameter R2 (see Figure 7(b)) of the tip non-corrugated tubular portion 12 of the anti-sway rebar attachment cutter cover 1B of embodiment 2 so that it can be attached to the outside of the tip non-corrugated tubular portion 12.

[0043] In addition, the tip cap 14 is provided with an annular connecting portion 14b that protrudes from the inside to the outside so as to be less likely to fall off after being attached to the tip side non-bellows tubular portion 12 of the anti-sway rebar attachment-cutting cover 1B of embodiment 2.

[0044] Therefore, when the tip cap 14 is brought close to the opening 12c of the tip side non-corrugated tubular portion 12 of the anti-sway rebar attachment-cutting cover 1B of embodiment 2 as shown in Figure 10(a), and the tip cap 14 is attached to the outside of the tip side non-corrugated tubular portion 12 as shown in Figure 10(b), the annular connecting portion 12b of the tip side non-corrugated tubular portion 12 of the anti-sway rebar attachment-cutting cover 1B fits inside the annular connecting portion 14b of the tip cap 14, allowing the connection to be made less likely to fall off.

[0045] Therefore, according to the attachment cut cover 1C for anti-sway rebar of embodiment 3 and the earthquake-resistant slit structure using it, like the attachment cut covers 1A and 1B for anti-sway rebar of embodiments 1 and 2, the bellows tubular portion 13 can be extended to cover the anti-sway rebar 3 according to its length, and even if the tip side non-bellows tubular portion 12 of the attachment cut cover for anti-sway rebar 1B of embodiment 2 has an opening 12b, by connecting the tip cap 14 to close the opening 12b of the tip side non-bellows tubular portion 12 as shown in Figures 10(a) and (b), it is possible to reliably prevent concrete slag from entering through the opening 12c of the tip side non-bellows tubular portion 12 of the attachment cut cover for anti-sway rebar 1B.

[0046] In addition, when the tip cap 14 is attached, the annular connecting portion 12b of the tip side non-corrugated tubular portion 12 of the anti-sway rebar attachment-cutting cover 1B and the annular connecting portion 14b of the tip cap 14 fit together and are connected in a state in which they are difficult to come loose, thereby more reliably preventing concrete sludge from entering through the opening 12c of the tip side non-corrugated tubular portion 12 of the anti-sway rebar attachment-cutting cover 1B.

[0047] In the above explanation, the tip cap 14 has an annular connecting portion 14b as shown in Figures 9 and 10(a), (b), etc., but the present invention is not limited to this. Of course, as shown in Figures 11(a) and (b), the tip non-bellows tubular portion 12' and the tip cap 14' may be provided with spiral connecting portions 12b', 14b', respectively, and the tip cap 14' may be fitted onto the outside of the tip non-bellows tubular portion 12' while rotating, thereby connecting the spiral connecting portions 12b', 14b' to each other.

[0048] Embodiment 4. The anti-sway rebar attachment cut covers 1A to 1C of the first to third embodiments do not take into consideration the prevention of concrete slag from entering through the gap between the base end non-bellows tubular portion 11 of the anti-sway rebar attachment cut covers 1A to 1C and the anti-sway rebar 3. Therefore, the anti-sway rebar attachment cut cover 1D of the fourth embodiment is configured to prevent as much as possible the intrusion of concrete slag from the gap between the base end non-bellows tubular portion 11 of the anti-sway rebar attachment cut cover 1D and the anti-sway rebar 3, and other configurations are the same as those of the anti-sway rebar attachment cut covers 1A to 1C of the first to third embodiments.

[0049] 12(a) and (b) are a cross-sectional view and a left side view, respectively, of the main parts of the base end non-bellows tubular portion 11 and the like, which are characteristic parts of the anti-sway rebar attachment-cutting cover 1D of embodiment 4. Note that the configurations of the tip end non-bellows tubular portion 12 and the bellows tubular portion 13 other than the base end non-bellows tubular portion 11 are the same as those of the anti-sway rebar attachment-cutting cover 1A of embodiment 1 described above, so the configurations of the tip end non-bellows tubular portion 12 and the bellows tubular portion 13 are given the same reference numerals and the description thereof is omitted.

[0050] In the attachment cutter cover 1D for anti-vibration rebars of the fourth embodiment, in order to prevent concrete slag from entering through the gap between the base end non-bellows tubular part 11 covering the base end side of the anti-vibration rebar 3 and the anti-vibration rebar 3 as much as possible when the cover is attached to the anti-vibration rebar 3, a valve piece 11c is provided that has a pleated shape extending toward the center as shown in Figures 12(a) and (b) and has a hole 11c1 in its center so as not to block the opening 11a (see Figures 1(c) and 2(a)) of the base end non-bellows tubular part 11. The inner diameter r4 of the hole 11c1 of the valve piece 11c is set to be less than the outer diameter R0 of the anti-vibration rebar 3 with the smallest outer diameter, i.e., the thinnest, of the anti-vibration rebars 3 with multiple outer diameters used.

[0051] Therefore, when attaching the attachment cut cover 1D for anti-sway rebar of the fourth embodiment to the anti-sway rebar 3, the anti-sway rebar 3 is passed through from the tip of the base end non-bellows tube portion 11 as shown in Fig. 4(a) etc., but even if the thinnest anti-sway rebar 3 among the anti-sway rebars 3 used is passed through, the valve piece 11c comes into contact with the anti-sway rebar 3 and falls toward the direction of travel (running) of the anti-sway rebar 3 as shown in Fig. 13(a), and the tip of the valve piece 11c comes into close contact with the surface of the anti-sway rebar 3. Note that even when the attachment cut cover 1D for anti-sway rebar of the fourth embodiment is attached to the anti-sway rebar 3 with a thick outer diameter R0, the valve piece 11c comes into contact with the anti-sway rebar 3 and falls toward the direction of travel (running) of the anti-sway rebar 3, and the tip of the valve piece 11c comes into close contact with the surface of the anti-sway rebar 3.

[0052] Then, as shown in Figures 4(b) and (c), by extending the bellows tubular portion 13 of the attachment cut cover 1D for the anti-sway rebar and bringing the tip of the base-end non-bellows tubular portion 11 closer to the base end of the anti-sway rebar 3, the valve piece 11c will eventually fall over as shown in Figure 13(b), and the tip of the valve piece 11c will remain in close contact with the surface of the anti-sway rebar 3.

[0053] Therefore, according to the attachment cut cover 1D for the anti-vibration rebar of the fourth embodiment and the earthquake-resistant slit structure using it, when it is attached to the anti-vibration rebar 3, the valve piece 11c of the base end non-bellows tube part 11 falls while being in close contact with the surface of the anti-vibration rebar 3, blocking the gap between the anti-vibration rebar 3 and the attachment cut cover 1B for the anti-vibration rebar, preventing concrete slag from entering through the gap between the anti-vibration rebar 3 and the anti-vibration rebar 3 and hardening, thereby fixing the anti-vibration rebar 3 to the wall body 1d. As a result, the anti-vibration rebar 3 can easily achieve the function of suppressing the out-of-plane deformation of the walls, columns, and beams due to horizontal shaking during an earthquake, etc., and damage to the columns, beams, foundations, walls, etc. of the reinforced concrete building can be prevented.

[0054] In addition, when attaching the attachment cutter cover 1D for anti-sway rebar to the anti-sway rebar 3, if you release your hand to extend the bellows tube portion 13, the bellows tube portion 13 may try to contract, as shown in Figures 4(a) to (c). However, the valve piece 11c falls while in close contact with the surface of the anti-sway rebar 3, and therefore the valve piece 11c acts as a stopper when extending the bellows tube portion 13, preventing the bellows tube portion 13 from contracting even if you release your hand, thereby improving work efficiency. In particular, when the bellows tube portion 13 is extended until the tip of the base end non-bellows tube portion 11 abuts the surface of the earthquake-resistant slit material 2e as shown in Figure 4 (c), the force that causes the bellows tube portion 13 to contract increases. However, even in this case, the valve piece 11c falls while in close contact with the surface of the anti-vibration rebar 3, thereby preventing the bellows tube portion 13 from contracting and preventing the tip of the base end non-bellows tube portion 11 from moving away from the surface of the earthquake-resistant slit material 2e. Therefore, in this respect too, it is possible to prevent concrete sludge from entering through the gap between the anti-vibration rebar 3 and the anti-vibration rebar attachment cut cover 1B.

[0055] In the description of embodiment 4, the valve piece 11c is provided at the opening 11a of the base-end non-bellows tubular portion 11, but in the present invention, the position is not limited to this, and it may of course be provided at the boundary between the base-end non-bellows tubular portion 11 and the bellows tubular portion 13, as shown in Figure 14(a).

[0056] In addition, in the description of the fourth embodiment, the valve piece 11c is described without any cuts, but the present invention is not limited to this, and for example, as shown in Fig. 14(b), a valve piece 11c' having a plurality of cuts 11c2' extending in the radial direction at intervals of, for example, 90 degrees may be provided at the opening 11a of the base-end non-bellows tubular portion 11 or at the boundary between the base-end non-bellows tubular portion 11 and the bellows tubular portion 13. By making cuts in the valve piece 11c' in this way, the valve piece 11c' is less likely to break and more likely to fall over when the anti-vibration rebar 3 is inserted.

[0057] Embodiment 5. The anti-vibration rebar attachment cut covers 1A to 1D of the above-mentioned embodiments 1 to 4 are placed over the anti-vibration rebar 3 embedded in the pillar 2a, beam 2b, foundation 2c, etc., as described above, and then concrete is poured to construct the wall 2d, so that after covering the anti-vibration rebar 3, when pouring the concrete for constructing the wall 2d, there is a possibility that the anti-vibration rebar attachment cut covers 1A to 1D may slip off or fall off from the anti-vibration rebar 3 due to the inflow pressure of the concrete, etc. Therefore, the anti-vibration rebar attachment cut cover 1E of embodiment 5 is made less likely to slip off from the anti-vibration rebar 3 due to the inflow pressure of the concrete when pouring the concrete, and other configurations are the same as those of the anti-vibration rebar attachment cut covers 1A to 1D of the embodiments 1 to 4.

[0058] 15(a) to (c) are a front view, a cross-sectional view, and a left side view showing characteristic parts of a vibration-prevention rebar attachment-cutting cover 1E according to a fifth embodiment of the present invention.

[0059] As shown in FIGS. 15(a) to (c), in a vibration-prevention rebar attachment-cutting cover 1E according to a fifth embodiment of the present invention, an opening 1a at the tip of a base-end non-bellows tubular portion 11 is provided with a flange portion 11d extending outward.

[0060] Therefore, in the attachment cut cover 1E for anti-sway rebar of embodiment 5, adhesive is applied or double-sided tape or the like is applied in advance to the surface of the flange portion 11d, and after the attachment cut cover 1E for anti-sway rebar is attached to the anti-sway rebar 3, when the bellows tube portion 13 of the attachment cut cover 1E for anti-sway rebar is pulled and extended to bring the flange portion 11d at the tip of the base end side non-bellows tube portion 11 into contact with the surface of the earthquake-resistant slit material 2e, the flange portion 11d can be adhered to the earthquake-resistant slit material 2e by the adhesive, double-sided tape, etc.

[0061] As a result, when the attachment cut cover 1E for the anti-sway rebar is attached to the anti-sway rebar 3, the attachment cut cover 1E for the anti-sway rebar can be adhered to the surface of the earthquake-resistant slit material 2e.Therefore, when the concrete that makes up the wall 2d is poured into a formwork (not shown) or the like from above the anti-sway rebar 3 with the attachment cut cover 1E for the anti-sway rebar attached, the anti-sway rebar 3 is less likely to slip off due to the inflow pressure of the concrete, etc.

[0062] In addition, when concrete is poured, it is blocked by the flange portion 11d at the tip of the base end non-corrugated tubular portion 11, and the inflow pressure of the concrete, etc., presses the flange portion 11d toward the earthquake-resistant slit material 2e, so that the attachment cut cover 1E for the anti-vibration rebar is tightly attached to the surface of the earthquake-resistant slit material 2e, making it possible to more reliably prevent concrete slag from entering through the gap between the base end non-corrugated tubular portion 11 and the anti-vibration rebar 3.

[0063] As a result, even if the valve pieces 11c, 11c' are not provided as in the attachment cut cover 1D for anti-vibration rebars of embodiment 4, concrete slag can be prevented from entering and hardening through the gap between the anti-vibration rebars 3 and the opening 1a at the tip of the base end side non-bellows tube part 11 of the attachment cut cover 1E for anti-vibration rebars, thereby preventing the anti-vibration rebars 3 and the wall body 1d from being fixed, and the function of suppressing out-of-plane deformation of the columns 2a, beams 2c, foundations 2d, walls 2d, etc. due to horizontal shaking during earthquakes, etc. by the anti-vibration rebars 3 can be easily achieved, and damage to the columns 2a, beams 2b, foundations 2c, walls 2d, etc. of the reinforced concrete structure can be prevented. However, it is of course possible to use the flange part 11d of the attachment cut cover 1E for anti-vibration rebars of embodiment 5 and the valve pieces 11c, 11c' of the attachment cut cover 1D for anti-vibration rebars of embodiment 4 in combination.

[0064] In the above description of embodiment 5, it was described that the flange portion 11d is provided integrally with the base end non-corrugated tubular portion 11 of the anti-sway rebar attachment-cutting cover 1E. However, the present invention is not limited to this. For example, as shown in Figures 16(a) and (b), it is also possible to fit a base end cap 15 having a flange portion 15d and an annular connecting portion 15b that fits into the annular connecting portion 11b to the base end non-corrugated tubular portion 11 of the anti-sway rebar attachment-cutting cover 1B of embodiment 2 having the annular connecting portion 11b, thereby forming an anti-sway rebar attachment-cutting cover 1E' having a flange portion 15d.

[0065] Embodiment 6. In the above embodiments 1 to 5, when the attachment cut covers 1A to 1E for anti-sway rebars are attached to the anti-sway rebars 3, they are all attached so that a hollow space S, which is an area within which the anti-sway rebar 3 can move in the event of an earthquake, is secured between the tip of the anti-sway rebar 3 and the blocking portion 12a as shown in Figure 6, but the hollow space S is secured by the worker's intuition, etc.

[0066] Therefore, the attachment cut cover 1F for anti-sway rebar in embodiment 6 is characterized in that, when attached to the anti-sway rebar 3, the hollow section S, which is the area within which the anti-sway rebar 3 can move in the event of an earthquake, is reliably secured within the non-corrugated tubular section 12 at the tip side of the attachment cut cover 1F for anti-sway rebar, regardless of the worker's intuition, etc.

[0067] Figures 17(a) and (b) are respectively a cross-sectional view of key parts such as the tip non-corrugated tubular portion 12 of the anti-sway rebar attachment cut-off cover 1F of embodiment 6 in a contracted state, and a cross-sectional view of key parts showing the state in which the anti-sway rebar attachment cut-off cover 1F is attached to the anti-sway rebar 3 and then the bellows tubular portion 13 is extended.

[0068] As shown in FIG. 17(a), in the attachment cut cover 1F for anti-vibration rebar of the sixth embodiment, a valve piece 12d is provided at the boundary between the inner peripheral surface of the bellows tube part 13 and the inner peripheral surface of the tip side non-bellows tube part 12, in the same manner as the valve piece 11c of the attachment cut cover 1D for anti-vibration rebar of the fourth embodiment, which is pleated and extends toward the center of the cavity (hollow part) and has a hole 12d1 formed at its center. Since the valve piece 12d of the sixth embodiment is also provided at the boundary between the inner peripheral surface of the bellows tube part 13 and the inner peripheral surface of the tip side non-bellows tube part 12, it is only necessary to provide the bellows tube part 13 at the boundary so as to extend inward by the protruding length of the valve piece 12d, as with the valve piece 11c of the fourth embodiment, so that the formation of the valve piece 12d is easy. The other configurations are the same as those of the attachment cut covers 1A to 1E for anti-vibration rebar of the first to fifth embodiments.

[0069] Furthermore, the inner diameter r5 of the hole 12d1 of the valve piece 12d is made less than the outer diameter R0 of the anti-sway bar 3 with the smallest, i.e., the thinnest, outer diameter among the multiple anti-sway bar 3 of different outer diameters used, so that the tip of the anti-sway bar 3 will abut and stop when attached to the anti-sway bar 3.

[0070] Therefore, when the attachment cut cover 1F for anti-sway rebar of embodiment 6 is attached to the anti-sway rebar 3, the anti-sway rebar 3 is passed through from the tip of the base end non-bellows tubular portion 11, and when it attempts to pass through the bellows tubular portion 13, the tip of the anti-sway rebar 3 abuts against the valve piece 12d provided at the boundary between the inner surface of the bellows tubular portion 13 and the inner surface of the tip side non-bellows tubular portion 12, as shown in Figure 17 (b), and the progress of the anti-sway rebar 3 is stopped by the valve piece 12d, so that a hollow portion S, which is an area within the tip side non-bellows tubular portion 12 where the anti-sway rebar 3 can move in the event of an earthquake, can be automatically secured.

[0071] Furthermore, as shown in Figures 4(a) to (c), the attachment cutter cover 1F for the anti-sway rebar is attached to the anti-sway rebar 3 while extending the bellows tube portion 13. However, since the tip of the anti-sway rebar 3 abuts against the valve piece 12d and stops as shown in Figure 17(b), even if the base end non-bellows tube portion 11 is pulled toward the earthquake-resistant slit material 2e to extend the bellows tube portion 13, the tip side non-bellows tube portion 12 does not move toward the earthquake-resistant slit material 2e, making it easier to extend the bellows tube portion 13 and improving work efficiency.

[0072] Furthermore, if an earthquake or the like occurs and the anti-sway rebar 3 moves in the direction of the blocked portion 12a of the tip-side non-bellows tubular portion 12 and the tip of the tip-side non-bellows tubular portion 12 presses strongly against the valve piece 12d at the boundary between the bellows tubular portion 13 and the tip-side non-bellows tubular portion 12, then, although not shown, the tip of the tip-side non-bellows tubular portion 12 will push down the valve piece 12d and move toward the hollow portion S of the tip-side non-bellows tubular portion 12, thereby reliably preventing the tip of the anti-sway rebar 3 from coming into contact with the concrete wall 2d and destroying the wall 2d or causing cracks.

[0073] Therefore, according to the attachment cut cover 1F for anti-sway rebar of embodiment 6 and the earthquake-resistant slit structure using it, the same effects can be obtained as the attachment cut covers 1A to 1E for anti-sway rebar of embodiments 1 to 5 above, and since a valve piece 12d is provided at the boundary between the inner surface of the bellows tube portion 13 and the inner surface of the tip-side non-bellows tube portion 12, when the attachment cut cover 1F for anti-sway rebar is attached to the anti-sway rebar 3, the tip of the anti-sway rebar 3 abuts against the valve piece 12d and stops, making it possible to automatically secure a hollow section S within the tip-side non-bellows tube portion 12, which is an area within which the anti-sway rebar 3 can move in the event of an earthquake, and it is possible to reliably prevent the tip of the anti-sway rebar 3 from damaging the wall 2d of a reinforced concrete structure, etc., in the event of an earthquake, etc.

[0074] In addition, when the attachment cut cover 1F for anti-sway rebar is attached to the anti-sway rebar 3, the tip of the anti-sway rebar 3 abuts against the valve piece 12d and stops, making it easier to extend the bellows tube portion 13 of the anti-sway rebar attachment cut cover 1F to bring the base end side non-bellows tube portion 11 closer to the base end of the anti-sway rebar 3, thereby improving workability when attaching the anti-sway rebar attachment cut cover 1B to the anti-sway rebar 3.

[0075] In addition, in the attachment cutter cover 1F for anti-vibration rebar in this embodiment 6, a hole 12d1 is provided in the center of the valve piece 12d at the boundary between the inner surface of the bellows tubular portion 13 and the inner surface of the tip-side non-bellows tubular portion 12, but in the present invention, even if this hole 12d1 is not provided, the tip of the anti-vibration rebar 3 will break through the valve piece 12d in the event of an earthquake, etc., so the central hole 12d1 may of course be omitted.

[0076] In the description of the sixth embodiment, no reference is made to the configuration of the base end non-bellows tube portion 11 of the attachment cut cover 1F for the anti-vibration rebar, but the valve pieces 11c, 11c' may not be provided on the base end non-bellows tube portion 11 as in the attachment cut covers 1A, 1B, and 1C for the anti-vibration rebar of the first to third embodiments, the valve pieces 11c, 11c' may be provided on the base end non-bellows tube portion 11 as in the attachment cut cover 1D for the anti-vibration rebar of the fourth embodiment, and the flange portion 11d may be provided as in the attachment cut cover 1E for the anti-vibration rebar of the fifth embodiment. The base end non-bellows tube portion 11 and the tip end non-bellows tube portion 12 may be provided with annular connecting portions 11b, 12b, respectively, as in the attachment cut covers 1B, 1C for the anti-vibration rebar of the second and third embodiments, and tip end caps 14, 14' that perform the same function as the blocking portion 12a may be provided.

[0077] In particular, when the attachment cut cover 1F for anti-sway rebar of embodiment 6 is provided with valve pieces 11c, 11c' on the base end non-bellows tube portion 11 as in the attachment cut cover 1D for anti-sway rebar of embodiment 4, it is possible to prevent concrete slag from entering through the gap between the attachment cut cover 1F for anti-sway rebar and the anti-sway rebar 3, and the valve pieces 11c, 11c' act as stoppers when the bellows tube portion 13 is extended, preventing the bellows tube portion 13 from contracting even if it is released, thereby greatly improving work efficiency together with the hollow portion S which automatically secures a movable area for the anti-sway rebar 3 in the event of an earthquake.

[0078] Furthermore, in the attachment cut cover 1F for anti-sway rebar of embodiment 6, a flange portion 11d is provided on the base end non-corrugated tubular portion 11 as in the attachment cut cover 1E for anti-sway rebar of embodiment 5, and adhesive, double-sided tape, etc. is provided on the flange portion 11d, which is very effective in preventing the attachment cut cover 1F for anti-sway rebar from falling off and preventing concrete sludge from entering through the gap between the attachment cut cover 1F for anti-sway rebar and the anti-sway rebar 3. [Explanation of symbols]

[0079] 1A~1F…Sway-proof rebar attachment cutter cover 11...Base end non-bellows tube portion 11a...Opening 11b...Annular connection part 11c,11c'...valve piece 11c1,11c1'...hole 11c2'...notch 11d…Tsubabe 12...Tip side non-bellows tube section 12a...Occluded part 12b, 12b'... Annular connection portion 12c…Opening 12d...Valve piece 12d1…hole 13…Bellows tube section 14…Tip cap 14a...Opening 14b, 14b'... Annular connecting portion 15…Base end cap 15a...Opening 15b...Ring-shaped connecting portion 15d…Tsubabe 2. Concrete structures 2a...Column 2b…Beam 2c…base 2d…Wall 2e… Earthquake-resistant slit material 3…Sway-proof steel bars

Claims

1. A cylindrical anti-sway rebar attachment cutter cover that covers anti-sway rebars that connect columns, beams, or foundations of a concrete structure to walls via earthquake-resistant slit materials, characterized in that the anti-sway rebar attachment cutter cover has a bellows tubular portion that expands and contracts by bellows folding processing to cover all or part of the anti-sway rebar.

2. In the anti-vibration rebar attachment cutter cover according to claim 1, A non-bellows tubular portion that is not bellows-folded is provided on both longitudinal sides of the bellows tubular portion, and a pleated valve piece is provided on the inner surface of the non-bellows tubular portion that becomes the base end side of the anti-sway bar when attached to the anti-sway bar, and a hole smaller than the outer diameter of the anti-sway bar is formed in the center of the valve piece.

3. In the anti-vibration rebar attachment cutter cover according to claim 1, A sway-stop rebar attachment cutter cover is characterized in that a non-bellows tubular portion that is not bellows-folded is provided on both longitudinal sides of the bellows tubular portion, and a flange portion extending toward the outside of the non-bellows tubular portion is provided at the tip of the non-bellows tubular portion, which becomes the base end of the sway-stop rebar when attached to the sway-stop rebar.

4. In the anti-vibration rebar attachment cutter cover according to claim 1, A sway-stop rebar attachment cutter cover is characterized in that a non-bellows tubular section that is not bellows-folded is provided on both longitudinal sides of the bellows tubular section, and each of the non-bellows tubular sections on both sides is provided with a connecting section that protrudes from the inner surface side toward the outer surface side or the opposite direction.

5. An earthquake-resistant slit structure for a concrete structure, characterized in that when the anti-sway rebar attachment cut-off cover described in any one of claims 1 to 4 is attached to the anti-sway rebar, the bellows tubular portion is extended to cover the entire anti-sway rebar, and the cover is attached so as to form a hollow portion between the end of the anti-sway rebar attachment cut-off cover and the end of the anti-sway rebar, which becomes an area in which the anti-sway rebar can move in the event of an earthquake.

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