Main reinforcement connection structure of a reinforcing cage

Abstract

This invention provides a main reinforcement connection structure for a reinforcing cage that effectively increases the rigidity of the reinforcing cage by using a main reinforcement connector that aligns and connects the ends of three main reinforcements. [Solution] As a main reinforcement connecting structure in which main reinforcement bundles 10, each consisting of bundles of main reinforcement bars 11 to 13, are connected at approximately equal intervals in the circumferential direction of the reinforcing cage 1, each main reinforcement bar 11 to 13 of each main reinforcement bundle 10 is extended along the inside of each hoop reinforcement bar 14 in the longitudinal direction of the reinforcing cage 1, and one end of one first main reinforcement bar 11 is connected to the other ends of two second and third main reinforcement bars 12 and 13 by a main reinforcement connector 2. Each main reinforcement connector 2 is fixed in a state in which the first main reinforcement bar 11 is positioned to be in contact with each hoop reinforcement bar 14 at a tangent line s together with the second main reinforcement bar 12 and spaced apart from the third main reinforcement bar 13, and the second and third main reinforcement bars 12 and 13 are positioned and fixed in a state in contact with each hoop reinforcement bar at a direction normal h to the tangent line s.

Description

Technical Field

[0005]

[0001] The present invention relates to a main reinforcement connecting structure for connecting the longitudinal ends of a plurality of main reinforcements to each other so as to fill the longitudinal direction in a reinforcing cage assembled in a cylindrical shape by a plurality of main reinforcements and a plurality of hoop reinforcements.

Background Art

[0002] Generally, since the length of each main reinforcement is longer than the length of this type of reinforcing cage, a plurality of main reinforcement bundles obtained by bundling a plurality of main reinforcements are provided at substantially equal intervals in the circumferential direction of each hoop reinforcement, and the longitudinal ends of each main reinforcement in each main reinforcement bundle are connected in order to connect them so that the longitudinal direction of the reinforcing cage is filled for each main reinforcement bundle.

[0003] However, in order to connect the longitudinal ends of each main reinforcement for each main reinforcement bundle, the connecting work while aligning their positions is very difficult and requires skilled techniques. Therefore, the workers are limited, and the work efficiency is extremely poor.

[0004] From this point, conventionally, in connecting and joining the longitudinal ends of each main reinforcement to each other, an assembly ring for a reinforcing cage in a ring shape extending in the circumferential direction along each hoop reinforcement has been used (see Patent Document 1). In this assembly ring for a reinforcing cage, insertion holes and connecting holes are continuously provided in the circumferential direction corresponding to each main reinforcement bundle. While inserting one end portion of one main reinforcement whose longitudinal ends are connected to each other into the insertion hole, by inserting the other end portion of the other main reinforcement into the connecting hole, it becomes possible to easily connect the longitudinal ends of each main reinforcement for each main reinforcement bundle while aligning their positions without skilled techniques, and the work efficiency has been expected to be improved.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] Incidentally, in some cases, a reinforcement cage uses a bundle of three main reinforcement bars, formed by connecting one end of a single first main reinforcement bar to the other ends of two pre-bundled second and third main reinforcement bars. In this case, the second and third main reinforcement bars of each main reinforcement bundle are arranged to be in contact with each hoop reinforcement bar in a direction perpendicular to the tangent, and the rigidity of the reinforcement cage is ensured by arranging the first main reinforcement bar together with the second main reinforcement bar in contact with each hoop reinforcement bar in a direction tangential, and spaced apart from the third main reinforcement bar.

[0007] In short, by arranging the first main reinforcement in each main reinforcement bundle so that it is in contact with the second main reinforcement in the tangential direction of each hoop reinforcement, one end of the first main reinforcement and the other end of the second main reinforcement are connected in contact with each hoop reinforcement, thereby ensuring the rigidity of the ends of the upper and lower first and second main reinforcement through their connection with each hoop reinforcement.

[0008] However, with the conventional rebar cage assembly rings mentioned above, although multiple main reinforcing bars can be arranged circumferentially for each main reinforcing bar bundle, it is not possible to arrange the remaining main reinforcing bar in the direction normal to the tangent to each hoop reinforcing bar while two of the three main reinforcing bars are arranged tangentially to each hoop reinforcing bar. Currently, the connection of both ends of the three main reinforcing bars relies on fixing with wire materials such as binding wire.

[0009] In this type of wire-based fixing, one end of the first main reinforcement bar is pulled towards the other ends of the two pre-bundled second and third main reinforcement bars, causing the ends of the three main reinforcement bars to overlap and the first main reinforcement bar to move away from the tangents of each hoop reinforcement bar. As a result, the first main reinforcement bar cannot be connected to the tangents of each hoop reinforcement bar together with the second main reinforcement bar, and the rigidity of the reinforcing cage cannot be effectively increased.

[0010] The present invention has been made in view of the above, and its object is to provide a main reinforcement connection structure for a reinforcing cage that can effectively increase the rigidity of the reinforcing cage by using a main reinforcement connector that can connect the ends of three main reinforcements while aligning them, and by connecting one end of the first main reinforcement with the other end of the second main reinforcement in a state where it is in contact with the tangent of each hoop reinforcement. [Means for solving the problem]

[0011] To achieve the above objective, the present invention is based on a main reinforcement connection structure in a reinforcing cage assembled in a cylindrical shape with a plurality of main reinforcements and a plurality of hoop reinforcements, wherein a plurality of main reinforcement bundles, each bundling the main reinforcements, are connected at intermediate positions in the longitudinal direction at approximately equal intervals in the circumferential direction of the reinforcing cage. Furthermore, each main reinforcement in each main reinforcement bundle is extended in the longitudinal direction of the reinforcing cage along the inside of each hoop reinforcement, and one end of one of the first main reinforcements is connected to the other ends of two second and third main reinforcements by a main reinforcement connector. The main reinforcement connector is characterized in that it is positioned and fixed so that the first main reinforcement is in contact with the hoop reinforcements together with the second main reinforcement at a tangent line and spaced apart from the third main reinforcement, and the second and third main reinforcements are fixed so that they are in contact with the hoop reinforcements at a normal direction perpendicular to the tangent line.

[0012] Furthermore, each main reinforcement connector is provided with a substantially V-shaped retaining fitting having a first retaining piece that extends linearly in the tangential direction to each hoop reinforcement so as to contact the first and second main reinforcements, and a second retaining piece that is bent from the inner end of the first retaining piece so as to contact the second and third main reinforcements and extends linearly in the direction normal to the tangency of each hoop reinforcement, and a substantially U-shaped screwing member having a bottom that extends linearly so as to contact the first and third main reinforcements, and having both ends that are screwed into the outer ends of the first and second retaining pieces of the retaining fitting, respectively.The first to third main reinforcements may be held in a state of pressure contact with the first retaining piece, the second retaining piece, and the bottom when the screwing member is screwed into the retaining fitting.

[0013] In contrast, each main reinforcement connector is provided with a retaining fitting that extends linearly in the direction normal to the tangent to each hoop reinforcement so as to be in contact with the second and third main reinforcements, and a substantially L-shaped screwing member whose one end is rotatably supported on the third main reinforcement side end of the retaining fitting, and whose other end extends linearly in the tangent to each hoop reinforcement after wrapping around a part of the circumference of the first main reinforcement while in contact with the third main reinforcement, and is screwed onto the second main reinforcement side end of the retaining fitting. The first to third main reinforcements may be held in a state of pressure contact with the retaining fitting and the screwing member, respectively, when the screwing member is screwed onto the retaining fitting.

[0014] Furthermore, each main reinforcement connector is provided with a retaining fitting having a first retaining piece extending linearly in the direction normal to the tangent to each hoop reinforcement so as to be in contact with the second and third main reinforcements, and a second retaining piece having one end rotatably supported on the third main reinforcement side end of the first retaining piece and extending linearly so as to be in contact with the first and third main reinforcements, and a fastening member extending linearly in the tangent direction to each hoop reinforcement and fastening the second main reinforcement side end of the first retaining piece with the other end of the second retaining piece.The first to third main reinforcements may be held in a state of being pressed against the first and second retaining pieces, respectively, when the fastening member is fastened to the retaining fitting.

[0015] Furthermore, each main reinforcement connector is provided with a retaining fitting having a first retaining piece extending linearly so as to be in contact with the first and third main reinforcements, and a substantially V-shaped second retaining piece extending linearly in the tangential direction of each hoop reinforcement and in the direction normal to the tangency, respectively, from a curved or bent portion that wraps around a part of the circumference of the second main reinforcement in the longitudinal center, so as to be in contact with the first and third main reinforcements, and a fastening member that fastens the ends of the first retaining piece and the second retaining piece together. The first to third main reinforcements may be held in a state of being pressed against the first and second retaining pieces, respectively, when the fastening member is fastened to the retaining fitting.

[0016] Furthermore, the retaining bracket may be provided with a contact piece that increases the contact area with at least one of the first to third main reinforcements that is in contact with the retaining bracket.

[0017] Furthermore, the retaining bracket or the screw-in member may be provided with an insertion piece that is inserted between both the first and third main reinforcements to ensure a spacing between them. [Effects of the Invention]

[0018] In short, one end of one of the first main reinforcement bars in each main reinforcement bundle is connected to the other ends of the two second and third main reinforcement bars by a main reinforcement connector. This main reinforcement connector fixes the second and third main reinforcement bars in a position where they are in contact with each hoop reinforcement bar in a direction normal to the tangent, and fixes one end of the first main reinforcement bar together with the other end of the second main reinforcement bar in a position where they are in contact with each hoop reinforcement bar in a direction tangential, and spaced apart from the third main reinforcement bar.

[0019] Therefore, the main reinforcement connector makes it possible to connect the three main reinforcement bars while aligning both ends, and it is possible to position the first and third main reinforcement bars apart from each other without the ends of the three main reinforcement bars overlapping, unlike fixing with wire materials such as binding wire.

[0020] This allows one end of the first main reinforcement and the other end of the second main reinforcement to be connected in contact with the tangent of each hoop reinforcement, thereby effectively increasing the rigidity of the reinforcing cage.

[0021] Furthermore, each main reinforcement connector is provided with a roughly V-shaped retaining fitting having a first retaining piece extending linearly in the tangential direction of each hoop reinforcement and a second retaining piece bending from the inner end of the first retaining piece and extending linearly in the direction normal to the tangential direction of each hoop reinforcement, and a roughly U-shaped screwing member having a linearly extending bottom and screwing both ends to the outer ends of the first and second retaining pieces of the retaining fitting, respectively. The first to third main reinforcements are held in a state of pressure contact with the first and second retaining pieces and the bottom when the screwing member is screwed to the retaining fitting. As a result, the ends of the first to third main reinforcements can be firmly fixed while aligning them simply by screwing both ends of the roughly U-shaped screwing member to the outer ends of the first and second retaining pieces of the retaining fitting.

[0022] In contrast, each main reinforcement connector is provided with a retaining bracket that extends linearly in the direction normal to the tangent to each hoop reinforcement, and a roughly L-shaped screwing member whose one end is rotatably supported on the third main reinforcement side end of the retaining bracket, and whose other end extends linearly in the tangent direction to each hoop reinforcement after wrapping around a part of the circumference of the first main reinforcement, and is screwed onto the second main reinforcement side end of the retaining bracket. The first to third main reinforcements are held in a state of pressure contact with the retaining bracket and screwing member when the screwing member is screwed onto the retaining bracket. As a result, the ends of the first to third main reinforcements can be firmly fixed while aligning them simply by screwing the other end of the screwing member, with one end pivoting on the third main reinforcement side end of the retaining bracket, onto the second main reinforcement side end of the retaining piece.

[0023] Furthermore, each main reinforcement connector is provided with a retaining fitting having a first retaining piece extending linearly in the direction normal to the tangent to each hoop reinforcement and a second retaining piece extending linearly with one end rotatably supported to the third main reinforcement side end of the first retaining piece, and a fastening member extending linearly in the tangent direction to each hoop reinforcement and fastening the second main reinforcement side end of the first retaining piece to the other end of the second retaining piece. The first to third main reinforcements are held in a state of pressure contact with the first and second retaining pieces, respectively, when the fastening member is fastened to the retaining fitting. As a result, by simply fastening the other end of the second retaining piece, with one end pivoting on the third main reinforcement side end of the first retaining piece of the retaining fitting, to each hoop reinforcement in the tangent direction using the fastening member, both ends of the first to third main reinforcements can be aligned and firmly fixed.

[0024] Further, each main reinforcement connecting member is provided with a substantially V-shaped holding metal fitting having a first holding piece extending linearly and a second holding piece extending linearly in the tangential direction of each hoop bar and in the normal direction to the tangent thereof so as to contact the first and third main reinforcements from a curved portion that goes around a part of the periphery of the second main reinforcement at the central portion in the longitudinal direction, and a fastening member for fastening between both ends of the first holding piece and the second holding piece, respectively. Then, the first to third main reinforcements are held in a state of being press-contact with the first and second holding pieces, respectively, when the fastening member is fastened to the holding metal fitting. Thereby, by simply fastening both ends of the first holding piece and the second holding piece of the holding metal fitting with the fastening member, both end portions of the first to third main reinforcements can be firmly fixed while being aligned.

[0025] Furthermore, by providing a contact piece on the holding metal fitting to expand the contact area between at least one main reinforcement that contacts the holding metal fitting among the first to third main reinforcements, the movement of at least one main reinforcement in the longitudinal direction that contacts the contact piece can be effectively restricted, the shape of the reinforcing cage can be effectively maintained, and the rigidity strength of the reinforcing cage can be increased.

[0026] Also, by providing an insertion piece for securing the separation interval between both main reinforcements in a state of being inserted between both the first main reinforcement and the third main reinforcement on the holding metal fitting or the screwing member, the third main reinforcement can be surely arranged toward the center of each hoop bar in a state of contacting the second main reinforcement in the normal direction to the tangent of each hoop bar, and the movement of the third main reinforcement in the longitudinal direction that contacts the insertion piece can be effectively restricted to further increase the rigidity strength of the reinforcing cage.

Brief Description of the Drawings

[0027] [Figure 1] It is a perspective view showing a position in the middle of the longitudinal direction of a reinforcing cage using the main reinforcement connecting structure according to the first embodiment of the present invention. [Figure 2] It is a front view of the reinforcing cage of FIG. 1. [Figure 3] It is a plan view of the reinforcing cage of FIG. 1. [Figure 4]Figure 1 is a plan view of the main reinforcement connector used in the main reinforcement connection structure when the main reinforcement is not held, as seen from the longitudinal direction of the reinforcing cage. [Figure 5] Figure 4 is a perspective view of the main reinforcement connector from the side of the retaining bracket. [Figure 6] Figure 4 is a perspective view of the main reinforcement connector as seen from the screw member side. [Figure 7] Figure 1 is a plan view of the main reinforcement connector in the main reinforcement holding state, as seen from the longitudinal direction of the reinforcing cage. [Figure 8] Figure 7 is a perspective view of the main reinforcement connector when the main reinforcement is being held in place. [Figure 9] This is a perspective view of a main reinforcement connector in a main reinforcement holding state, used in a main reinforcement connection structure according to a second embodiment of the present invention. [Figure 10] Figure 9 is a perspective view of the main reinforcement connector in the state where the main reinforcement is not being held. [Figure 11] This is a perspective view of a main reinforcement connector in a main reinforcement holding state, used in a main reinforcement connection structure according to a third embodiment of the present invention. [Figure 12] Figure 11 is a perspective view of the main reinforcement connector in the state where the main reinforcement is not held. [Figure 13] This is a perspective view of a main reinforcement connector in a main reinforcement holding state used in a main reinforcement connection structure according to a fourth embodiment of the present invention. [Figure 14] Figure 13 is a perspective view of the main reinforcement connector in the state where the main reinforcement is not being held. [Figure 15] This is a perspective view of a main reinforcement connector in a main reinforcement holding state, used in a main reinforcement connection structure according to a fifth embodiment of the present invention. [Figure 16] Figure 15 is a perspective view of the main reinforcement connector in the state where the main reinforcement is not held. [Figure 17] This is a perspective view from diagonally above of a main reinforcement connector used in a main reinforcement connection structure according to the sixth embodiment of the present invention, in a state where the main reinforcement is not held. [Figure 18] Figure 17 is a perspective view of the main reinforcement connector seen from diagonally below. [Figure 19] Figure 17 is a side view of the main reinforcement connector, with the male threaded portion facing upwards. [Figure 20]Figure 19 is a bottom view of the main reinforcement connector, seen from below. [Figure 21] Figure 19 is a plan view of the main reinforcement connector as seen from above, in the state in which the main reinforcement is held. [Modes for carrying out the invention]

[0028] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0029] Figure 1 is a perspective view showing an intermediate position in the longitudinal direction of a reinforcing cage using the main reinforcement connection structure according to the first embodiment of the present invention. Figure 2 is a front view of the reinforcing cage of Figure 1, and Figure 3 is a plan view of the reinforcing cage of Figure 1.

[0030] As shown in Figures 1 to 3, 1 is a reinforcing cage, which is assembled in a cylindrical shape using multiple main reinforcements 11, 12, 13 and multiple hoop reinforcements 14, 14, ... This reinforcing cage 1 is used when constructing foundation piles for buildings, bridges, etc. It is inserted into pile holes excavated in the ground, and after the ready-mix concrete filled in this state is cured, it is used as a cast-in-place pile.

[0031] Eight main reinforcement bundles 10, 10, ... are provided at approximately equal intervals around the circumferential direction of the reinforcing cage 1, each bundling three first to third main reinforcement bars 11, 12, and 13. Each main reinforcement bar 11 to 13 in each main reinforcement bundle 10 extends along the inside of each ring-shaped hoop reinforcement bar 14 in the longitudinal direction of the reinforcing cage 1.

[0032] Each main reinforcement bar 11-13 is shorter than the longitudinal length of the reinforcing cage 1, so they are spliced ​​together sequentially at each main reinforcement bundle 10. In other words, one end of one of the main reinforcement bars 11 (the upper end in Figures 1 and 2) and the other ends of the two main reinforcement bars 12 and 13 (the lower ends in Figures 1 and 2) are connected by a main reinforcement connector 2 at intermediate points along the longitudinal direction of the reinforcing cage 1 at each main reinforcement bundle 10. In this case, the lower end of the first main reinforcement bar 11 of each main reinforcement bundle 10 is in contact with the bottom surface of the pile hole, and the lower ends of the second and third main reinforcement bars 12 and 13 are spliced ​​to the upper end of the first main reinforcement bar 11, so that the reinforcing cage 1 extends in the longitudinal direction.

[0033] Figure 4 shows a plan view of the main reinforcement connector 2 used in the main reinforcement connection structure in the main reinforcement connection structure in the main reinforcement cage 1 of Figure 1, viewed from the longitudinal direction. Figure 5 shows a perspective view of the main reinforcement connector 2 of Figure 4, viewed from the retaining bracket side, and Figure 6 shows a perspective view of the main reinforcement connector 2 of Figure 4, viewed from the screwing member side. Furthermore, Figure 7 shows a plan view of the main reinforcement connector 2 in the main reinforcement holding state, viewed from the longitudinal direction of the reinforcing cage 1 of Figure 1, and Figure 8 shows a perspective view of the main reinforcement connector 2 in the main reinforcement holding state of Figure 7.

[0034] As shown in Figures 4 to 8, the main reinforcement connector 2 of each main reinforcement bundle 10 comprises a roughly V-shaped retaining fitting 23 in which the inner ends of the first retaining piece 21 and the second retaining piece 22 are bent at approximately 90°, and a roughly U-shaped screwing member 24 having male threaded portions 241, 241 at both ends so as to be screwed onto the outer ends (both left and right ends in Figure 4) of the first and second retaining pieces 21, 22, respectively. In this case, the screwing member 24 is equipped with nuts 242, 242 that are screwed onto both male threaded portions 241, 241, respectively.

[0035] The retaining bracket 23 is formed from SS steel (rolled steel for general structural use). The first retaining piece 21 extends linearly in the tangential s direction of each hoop reinforcement 14 so as to be in contact with the first and second main reinforcements 11 and 12. At this time, the first and second main reinforcements 11 and 12 are in contact with each other in the tangential s direction of each hoop reinforcement 14 and are in contact with the first retaining piece 21.

[0036] On the other hand, the second retaining piece 22 is bent at approximately 90° from the inner end (right end in Figure 4) of the first retaining piece 21 so as to be in contact with the second and third main reinforcement bars 12 and 13, and extends linearly in the direction of the normal h direction to the tangent s of each hoop reinforcement bar 14. At this time, the second and third main reinforcement bars 12 and 13 are in contact with the second retaining piece 22 in a state where they are in contact with each other in the direction of the normal h direction to the tangent s of each hoop reinforcement bar 14.

[0037] Furthermore, the outer ends of the first and second retaining pieces 21 and 22 are provided with bent plate pieces 231 and 231 that are bent at approximately 135° from their respective outer ends so as to face the tip surfaces of the two male threaded portions 241 and 241 of the screw fastening member 24. The bottom portion 243 of the screw fastening member 24 extends in a straight line so as to be in contact with the first and third main reinforcement bars 11 and 13.

[0038] Each bent plate piece 231 is provided with a pair of bent pieces 233, 233 that bend from both ends in the short direction and extend parallel to each other, ensuring the rigid strength of each bent plate piece 231. Each bent plate piece 231 is also provided with an insertion hole 232 through which the male threaded portion 241 of the screw fastening member 24 is inserted. The retaining bracket 23 and the screw fastening member 24 are screwed together by screwing nuts 242, 242 from the back side of each bent plate piece 231 to the two male threaded portions 241, 241 that are inserted into the insertion hole 232 from the surface side of each bent plate piece 231 at the outer ends of the first and second retaining pieces 21, 22.

[0039] The retaining bracket 23 is provided with a pair of upper and lower contact pieces 234, 234 that increase the contact area between the first retaining piece 21 and the first and second main reinforcing bars 11 and 12 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connector 2. Each contact piece 234 protrudes approximately horizontally in a trapezoidal shape from intermediate positions in the longitudinal direction at both the upper and lower ends of the first retaining piece 21, and is in contact with the first and second main reinforcing bars 11 and 12 while inserted between them.

[0040] Furthermore, the retaining fitting 23 is provided with a pair of upper and lower contact pieces 235, 235 that increase the contact area between the second retaining piece 22 and the second and third main reinforcing bars 12 and 13 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connector 2. Each contact piece 235 protrudes approximately horizontally in a trapezoidal shape from intermediate positions in the longitudinal direction at both the upper and lower ends of the second retaining piece 22, and is in contact with the second and third main reinforcing bars 12 and 13 while being inserted between them.

[0041] Furthermore, when the screw-fastening member 24 is screwed onto the retaining fitting 23, the first to third main reinforcing bars 11 to 13 are held in a state of being pressed against the first retaining piece 21 and the second retaining piece 22, as well as the bottom portion 243 of the screw-fastening member 24, in conjunction with contact with the respective contact pieces 234 and 235.

[0042] Therefore, in this embodiment, one end (upper end) of one of the first main reinforcement bars 11 from among the main reinforcement bars 11 to 13 of each main reinforcement bundle 10 and the other ends (lower ends) of the two second and third main reinforcement bars 12 and 13 are connected by a main reinforcement connector 2. This main reinforcement connector 2 fixes the second and third main reinforcement bars 12 and 13 in a state where they are in contact with each hoop reinforcement bar 14 in the direction normal to the tangent line s, and fixes the first main reinforcement bar 11 together with the second main reinforcement bar 12 in a state where they are in contact with each hoop reinforcement bar 14 in the direction tangent line s, and spaced apart from the third main reinforcement bar 13.

[0043] Therefore, the main reinforcement connector 2 makes it possible to connect the three main reinforcements 11-13 while aligning both ends, and it is possible to position the first main reinforcement 11 and the third main reinforcement 13 apart from each other without the ends of the three main reinforcements 11-13 overlapping, as is the case with fixing with wire materials such as binding wire.

[0044] This allows one end of the first main reinforcement 11 and the other end of the second main reinforcement 12 to be connected in contact with the tangent s of each hoop reinforcement 14, thereby effectively increasing the rigidity of the reinforcing cage 1.

[0045] Furthermore, each main reinforcement connector 2 includes a roughly V-shaped retaining fitting 23 having a first retaining piece 21 and a second retaining piece 22, and a roughly U-shaped screwing member 24 having a linearly extending bottom portion 243, which screws onto the bent plate pieces 231 of the first and second retaining pieces 21 and 22 of the retaining fitting 23 by screwing on nuts 242, 242 from the back side of each bent plate piece 231. The first to third main reinforcement bars 11 to 13 are held in a state of pressure contact with the first retaining piece 21 and the second retaining piece 22 and the bottom portion 243 of the screwing member 24 when the screwing member 24 is screwed onto the retaining fitting 23. As a result, the ends of the first to third main reinforcing bars 11 to 13 can be firmly fixed while aligning them, simply by screwing the two male threaded portions 241, 241 and nuts 242, 242 of the roughly U-shaped screw member 24 to each of the bent plate pieces 231 of the first and second retaining pieces 21, 22 of the retaining fitting 23.

[0046] Furthermore, since contact pieces 234 and 235 are provided at both the upper and lower ends of the first and second retaining pieces 21 and 22, which increase the contact area between the first to third main reinforcements 11 to 13 that are in contact with the first retaining piece 21 and the second retaining piece 22 of the retaining fitting 23, the longitudinal movement of each main reinforcement 11 to 13 that is in contact with each contact piece 234 and 235 can be effectively restricted, the shape of the reinforcing cage 1 can be effectively maintained, and the rigid strength of the reinforcing cage 1 can be increased.

[0047] Next, a second embodiment of the present invention will be described with reference to the drawings.

[0048] In this embodiment, the configuration of the main reinforcement connectors for each main reinforcement bundle 10 has been changed. Note that the other components, excluding the main reinforcement connectors, are the same as in the first embodiment; therefore, the same reference numerals are used for the same parts, and their detailed descriptions are omitted.

[0049] Figure 9 is a perspective view of the main reinforcement connector in the state in which the main reinforcement is held, used in the main reinforcement connection structure according to the second embodiment of the present invention, and Figure 10 is a perspective view of the main reinforcement connector in the state in which the main reinforcement is not held, as shown in Figure 9.

[0050] As shown in Figures 9 and 10, the main reinforcement connector 3 of each main reinforcement bundle 10 comprises a retaining bracket 31 that extends linearly in the direction of the normal h to the tangent s of each hoop reinforcement 14, and a substantially L-shaped screwing member 33 that is rotatably supported at one end of the retaining bracket 31 via a pin 32 and has a male threaded portion 331 at its tip so as to be screwed into the other end of the retaining bracket 31.

[0051] The retaining bracket 31 is formed from SS steel (rolled steel for general structural use) and extends linearly so as to be in contact with the second and third main reinforcement bars 12 and 13. At this time, the second and third main reinforcement bars 12 and 13 are in contact with the retaining bracket 31 in a state where they are in contact with each other in the direction of the normal h to the tangent s of each hoop reinforcement bar 14.

[0052] Furthermore, the retaining bracket 31 is provided with a pair of bent pieces 312, 312 that bend from both of its short sides and extend parallel to each other. A pin 32 at one end of the retaining bracket 31 is attached between the bent pieces 312, 312 at the end of the retaining bracket 31 on the third main reinforcement 13 side (the right end in Figures 9 and 10), and supports one end of the screw-fastening member 33 so as to be rotatable around the axis of the pin 32.

[0053] On the other hand, the screw-fastening member 33 is in contact with the third main reinforcement 13 at the end of the retaining bracket 31 on the third main reinforcement 13 side, and extends linearly around a portion of the circumference of the first main reinforcement 11 (for example, about 1 / 3 of the circumference) in the tangential s direction to each hoop reinforcement 14, with a male threaded portion 331 at the other end. The screw-fastening member 33 is also equipped with a nut 332 that screws onto the male threaded portion 331. At this time, the third main reinforcement 13 is in contact with the screw-fastening member 33 between itself and the retaining bracket 31, while the first and second main reinforcement 11 and 12 are in contact with each other in the tangential s direction to each hoop reinforcement 14 and are in contact with the screw-fastening member 33.

[0054] Furthermore, at the other end of the retaining bracket 31, which is the end on the second main reinforcement 12 side (the left end in Figures 9 and 10), a notched recess 313 is provided, which is created by cutting out the retaining bracket 31 from the end on the second main reinforcement 12 side. The male threaded portion 331 of the screw-fastening member 33, which rotates around the axis of the pin 32, is inserted through this recess and screwed in with a nut 332.

[0055] The retaining bracket 31 is provided with a pair of upper and lower contact pieces 314 (only one shown) in the short direction, which increase the contact area with the second and third main reinforcing bars 12 and 13 that come into contact with the retaining bracket 31 when each main reinforcing bar bundle 10 is connected by the main reinforcing bar connector 3. Each contact piece 314 is made up of the remaining portion of a roughly semicircular cutout that allows roughly half the circumference of the second and third main reinforcing bars 12 and 13 to fit into the bent pieces 312, 312, and contacts the periphery of the second and third main reinforcing bars 12 and 13 not only between the two main reinforcing bars 12 and 13 but also from the sides opposite the second and third main reinforcing bars 12 and 13, thereby increasing the contact area.

[0056] Furthermore, when the screw-fastening member 33 is screwed onto the retaining fitting 31, the first to third main reinforcement bars 11 to 13 are held in a state of being pressed against the retaining fitting 31 and the screw-fastening member 33 in conjunction with contact with each contact piece 314.

[0057] Therefore, in this embodiment, each main reinforcement connector 3 includes a retaining fitting 31 that extends linearly in the direction normal to the h with respect to the tangent s of each hoop reinforcement 14, and a substantially L-shaped screwing member 33 that is supported at one end of the retaining fitting 31 on the side of the third main reinforcement 13 so as to be rotatable around the axis of a pin 32, and whose other end extends linearly in the direction tangent s of each hoop reinforcement 14 after rotating around a part of the circumference of the first main reinforcement 11 and is screwed into the side of the retaining fitting 31 on the side of the second main reinforcement 12. The first to third main reinforcement 11 to 13 are held in a state of being pressed against the retaining fitting 31 and the screwing member 33 when the screwing member 33 is screwed into the retaining fitting 31. As a result, the ends of the first to third main reinforcements 11 to 13 can be firmly fixed while aligning them, simply by inserting the male threaded portion 331 of the screw-fastening member 33, with the pin 32 at one end as a pivot point, into the notched recess 313 at the second main reinforcement end of the retaining bracket 31 and screwing it in with a nut 332.

[0058] Next, a third embodiment of the present invention will be described with reference to the drawings.

[0059] In this embodiment, the configuration of the main reinforcement connectors for each main reinforcement bundle 10 has been changed. Note that the other components, excluding the main reinforcement connectors, are the same as in the first embodiment; therefore, the same reference numerals are used for the same parts, and their detailed descriptions are omitted.

[0060] Figure 11 is a perspective view of the main reinforcement connector in the state in which the main reinforcement is held, used in the main reinforcement connection structure according to the third embodiment of the present invention, and Figure 12 is a perspective view of the main reinforcement connector in the state in which the main reinforcement is not held, as shown in Figure 11.

[0061] As shown in Figures 11 and 12, the main reinforcement connector 4 of each main reinforcement bundle 10 comprises a retaining fitting 43 having a first retaining piece 41 extending linearly in the direction normal h to the tangent s of each hoop reinforcement 14, and a second retaining piece 42 extending linearly with one end of the first retaining piece 41 rotatably supported via a pin 40, and a fastening member 44 that fastens the other end of the first retaining piece 41 and the other end of the second retaining piece 42. The retaining fitting 43 is formed from SS steel (rolled steel for general structural use).

[0062] The first retaining piece 41 extends linearly so as to be in contact with the second and third main reinforcement bars 12 and 13. At this time, the second and third main reinforcement bars 12 and 13 are in contact with the first retaining piece 41 in a state where they are in contact with each other in the direction of the normal h to the tangent s of each hoop reinforcement bar 14.

[0063] Furthermore, the first retaining piece 41 is provided with a pair of bent pieces 412, 412 that bend from both ends in its short direction and extend parallel to each other. A pin 40 at one end of the first retaining piece 41 is attached between the bent pieces 412, 412 at the end of the first retaining piece 41 on the third main reinforcement 13 side (the right end in Figures 11 and 12), and supports one end of the second retaining piece 42 so as to be rotatable around the axis of the pin 40.

[0064] On the other hand, the second retaining piece 42 extends in a straight line so as to be in contact with the first and third main reinforcing bars 11 and 13. At this time, the first and third main reinforcing bars 11 and 13 are spaced apart from each other and are in contact with the second retaining piece 42.

[0065] Furthermore, the second retaining piece 42 is also provided with a pair of bent pieces 422, 422 that bend from both ends in its short direction and extend parallel to each other. The length of the second retaining piece 42 in its short direction is set to be slightly shorter than the length between the bent pieces 412, 412 of the first retaining piece 41 so that the second retaining piece 42 fits between the bent pieces 412, 412 of the first retaining piece 41, thereby enabling the second retaining piece 42 to rotate around the pin 40 axis.

[0066] The screw-fastening member 44 is a long hexagonal bolt having a male threaded portion 441 on its shaft, extending in the tangential s direction of each hoop reinforcement 14, and fastening the other end of the first retaining piece 41, which is the second main reinforcement 12 side end (left end in Figures 11 and 12), and the other end of the second retaining piece 42, which is the first main reinforcement 11 side end (left end in Figures 11 and 12). The screw-fastening member 44 also has a nut 442 that screws onto the male threaded portion 441.

[0067] Furthermore, the end of the first retaining piece 41 on the side facing the second main reinforcement 12 is provided with a notched recess 413 cut out from the end of the first retaining piece 41 opposite the side facing the third main reinforcement 13. On the other hand, the end of the second retaining piece 42 on the side facing the first main reinforcement 11 is provided with a bolt insertion hole 423 that penetrates the second retaining piece 42, and the male threaded portion 441 of the screw fastening member 44 is inserted through the bolt insertion hole 423 and the notched recess 413 and then screwed in with a nut 442.

[0068] The retaining fitting 43 is provided with contact pieces 414 (only one shown) that increase the contact area of ​​the second and third main reinforcing bars 12 and 13 with the first retaining piece 41 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connector 4. Each of these contact pieces 414 is made up of the remaining portion of the first retaining piece 41 that has been cut out in a roughly semi-circular shape so that roughly half of the second and third main reinforcing bars 12 and 13 fit into each bent piece 412 of the first retaining piece 41. The contact pieces 414 contact the area around the second and third main reinforcing bars 12 and 13 not only between the two main reinforcing bars 12 and 13 but also from the sides opposite the second and third main reinforcing bars 12 and 13, thereby increasing the contact area.

[0069] Furthermore, the retaining bracket 43 is provided with contact pieces 424 (only one shown) that increase the contact area between the first and third main reinforcing bars 11 and 13 and the second retaining piece 42 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connectors 4. The retaining bracket 43 is also provided with insertion pieces 425, 425 that are inserted between the first and third main reinforcing bars 11 and 13 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connectors 4, thereby ensuring a distance between the two main reinforcing bars 11 and 13.

[0070] Each contact piece 424 is formed by the remaining portion of the second holding piece 42 that has been cut out in a roughly semi-circular shape so that approximately half of the circumference of the first and third main reinforcement bars 11 and 13 fits into each bent piece 422 of the second holding piece 42. This increases the contact area by contacting the periphery of the first and third main reinforcement bars 11 and 13 not only between the two main reinforcement bars 12 and 13 but also from the opposite side of the first and third main reinforcement bars 11 and 13.

[0071] Each insertion piece 425 is positioned to be inserted between two adjacent contact pieces 424, 424 of each contact piece 424, and by separating these two contact pieces 424, 424 from each other, the spacing between the main reinforcement bars 11, 13 is ensured.

[0072] Furthermore, when the screw fastening member 44 fastens the first to third main reinforcing bars 11 to 13 of the first retaining piece 41 to the second main reinforcing bar 12 side end and the screw fastening member 44 fastens the first main reinforcing bar 11 side end of the second retaining piece 42, the first retaining piece 41 and the second retaining piece 42 of the retaining fitting 41 are held in a state of pressure contact with each of the contact pieces 414 and 424.

[0073] Therefore, in this embodiment, each main reinforcement connector 4 includes a retaining fitting 43 having a first retaining piece 41 that extends linearly in the direction normal h to the tangent s of each hoop reinforcement 14, and a second retaining piece 42 that extends linearly with one end of the first retaining piece 41 rotatably supported on the third main reinforcement 13 side end, and a fastening member 44 that extends linearly in the direction tangent s of each hoop reinforcement 14 and fastens the first retaining piece 41 on the second main reinforcement 12 side end and the other end of the second retaining piece 42. The first to third main reinforcement reinforcing bars 11 to 13 are held in a state of being pressed against the first and second retaining pieces 41 and 42, respectively, when the fastening member 44 is fastened to the retaining fitting 43. As a result, the fastening member 44 can be firmly fixed in the tangential s direction of each hoop reinforcement 14 simply by screwing the nut 442 onto the male threaded portion 441 of the screw fastening member 44, which is inserted through the bolt insertion hole 423 of the second retaining piece 42 via the notched recess 413 of the first retaining piece 41, while the pin 40 at one end of the retaining fitting 43 is pivoted relative to the end of the third main reinforcement 13, and then the ends of the first to third main reinforcement 11 to 13 can be firmly fixed while being aligned.

[0074] Furthermore, since the second retaining piece 42 of the retaining fitting 43 is provided with an insertion piece 425 that is inserted between both the first main reinforcement 11 and the third main reinforcement 13 to ensure a spacing between the two main reinforcement bars 11 and 13, the first main reinforcement bar 11 can be positioned together with the second main reinforcement bar 12 in contact with the tangent s of each hoop reinforcement bar 14, thereby increasing the rigid strength of the reinforcing cage 1.

[0075] Furthermore, when the first to third main reinforcement bars 11 to 13 are screwed together by the screw fastening member 44 between the first retaining piece 41 and the second retaining piece 42, the contact between the first and second retaining pieces 414, 424 and the insertion piece 425 of the first and second retaining pieces 41 and 42, combined with the contact between the contact pieces 414, 424 and the insertion piece 425 of the first and second retaining pieces 41 and 42, allows them to be held in a more firmly pressed-together state.

[0076] Next, a fourth embodiment of the present invention will be described with reference to the drawings.

[0077] In this embodiment, the configuration of the main reinforcement connectors for each main reinforcement bundle 10 has been changed. Note that the other components, excluding the main reinforcement connectors, are the same as in the first embodiment; therefore, the same reference numerals are used for the same parts, and their detailed descriptions are omitted.

[0078] Figure 13 shows a perspective view of the main reinforcement connector in the state in which the main reinforcement is held, used in the main reinforcement connection structure according to the fourth embodiment of the present invention, and Figure 14 shows a perspective view of the main reinforcement connector in the state in which the main reinforcement is not held, as shown in Figure 13.

[0079] As shown in Figures 13 and 14, the main reinforcement connector 5 of each main reinforcement bundle 10 comprises a retaining fitting 53 having a first retaining piece 51 that extends in a straight line and a second retaining piece 52 that has a curved portion 520 in the longitudinal center and extends substantially in a straight line on both sides, and fastening members 54, 54 that fasten the ends of the first and second retaining pieces 51, 52 together, respectively. Each fastening member 54 is a long hexagonal bolt having a male threaded portion 541 on its shaft. The retaining fitting 53 is formed from SS steel (rolled steel for general structural use).

[0080] The first retaining piece 51 extends linearly so as to be in contact with the first and third main reinforcing bars 11 and 13. The first retaining piece 51 is also provided with a pair of bent pieces 512, 512 that bend from both ends in its short direction and extend parallel to each other. At this time, the first and third main reinforcing bars 11 and 13 are spaced apart from each other and in contact with the first retaining piece 51.

[0081] On the other hand, the second retaining piece 52 is formed in a roughly V-shape, extending linearly from its longitudinal center, which wraps around a part of the periphery of the second main reinforcement 12 in the curved portion 520, in the direction of the tangent s of each hoop reinforcement 14 and in the direction of the normal h of that tangent s, so as to be in contact with the first or third main reinforcement 11, 13. At this time, the first and second main reinforcement 11, 12 are in contact with each other in the direction of the tangent s of each hoop reinforcement 14 and are in contact with the second retaining piece 52, while the second and third main reinforcement 12, 13 are in contact with each other in the direction of the normal h of the tangent s of each hoop reinforcement 14 and are in contact with the second retaining piece 52.

[0082] The outer ends of the second retaining piece 52 are provided with bent plate pieces 522, 522 that are bent at approximately 135° from their respective outer ends so as to face the outer ends of the first retaining piece 51. In addition, the second retaining piece 52 and each bent plate piece 522 are provided with a pair of bent pieces 523, 523 that are bent from both ends in their shorter direction and extend parallel to each other.

[0083] Each bent plate piece 522 of the second retaining piece 52 is provided with an insertion hole 525 through which the male threaded portion 541 of the fastening member 54 is inserted. On the other hand, the outer end of the first retaining piece 51 is provided with a screw hole 513 into which the male threaded portion 541 of each fastening member 54 is screwed. The first retaining piece 51 and the second retaining piece 52 of the retaining fitting 53 are screwed together by screwing the male threaded portion 541 of the screw fastening member 54, which is inserted through the insertion hole 525 of each bent plate piece 522 of the second retaining piece 52, into the screw hole 513 of the first retaining piece 51.

[0084] Furthermore, the retaining fitting 53 is provided with contact pieces 514, 514, respectively, which increase the contact area between the first and third main reinforcing bars 11 and 13 and the first retaining piece 51 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connectors 5. In addition, the retaining fitting 53 is provided with insertion pieces 515, 515, respectively, which are inserted between the first and third main reinforcing bars 11 and 13 that are in contact with the first retaining piece 41 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connectors 5, thereby ensuring a distance between the two main reinforcing bars 11 and 13.

[0085] Each contact piece 514 is formed by the remaining portion of the first retaining piece 51 that has been cut out in a roughly semi-circular shape so that approximately half of the circumference of the first and third main reinforcing bars 11 and 13 fits into each bent piece 512 of the first retaining piece 51. The contact piece 514 contacts the first and third main reinforcing bars 11 and 13 not only between the two main reinforcing bars 12 and 13 themselves, but also from the sides of the two main reinforcing bars 12 and 13 that are opposite the first and third main reinforcing bars 11 and 13, thereby increasing the contact area.

[0086] Each insertion piece 515 is positioned to be inserted between two adjacent contact pieces 514, 514 of each contact piece 514, and by separating these two contact pieces 514, 514 from each other, the spacing between the main reinforcement bars 11, 13 is ensured.

[0087] Furthermore, the retaining fitting 53 is provided with contact pieces 524 that increase the contact area between the first to third main reinforcing bars 11 to 13 and the second retaining piece 52 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connector 5. Each contact piece 524 is made up of the remaining portion of the second retaining piece 52 that is cut out in a roughly semi-circular shape so that approximately half the circumference of the first and second main reinforcing bars 11, 12 and approximately half the circumference of the second and third main reinforcing bars 12, 13 fits into each bent piece 512 of the second retaining piece 52, thereby increasing the contact area around the first and second main reinforcing bars 11, 12 and the second and third main reinforcing bars 12, 13, not only between the two main reinforcing bars 11, 12 (and 12, 13) but also from the opposite side of the first and second main reinforcing bars 11, 12 and the opposite side of the second and third main reinforcing bars 12, 13.

[0088] Furthermore, when the first to third main reinforcing bars 11 to 13 are screwed together by the respective screw fastening members 54 to the first retaining piece 51 and the second retaining piece 52, the first retaining piece 51 and the second retaining piece 52 of the retaining fitting 51 are held in a state of pressure contact with the respective contact pieces 514 and 524, in conjunction with the contact with the respective contact pieces 514 and 524.

[0089] Therefore, in this embodiment, each main reinforcement connector 5 has a retaining fitting 53 having a linearly extending first retaining piece 51 and a substantially V-shaped second retaining piece 52 that extends linearly in the tangential s direction of each hoop reinforcement 14 and the normal h direction to the tangential s, respectively, so as to contact the first and third main reinforcement 11 and 13 from a curved portion 520 that wraps around a part of the circumference of the second main reinforcement 12 in the longitudinal center, and screwing members 54, 54 that screw male screw portions 541 inserted through insertion holes 525 in each bent plate piece 522 of the second retaining piece 52 of the retaining fitting 53 into screw holes 513 of the first retaining piece 51. The first to third main reinforcement 11 to 13 are held in a state of being pressed against the first and second retaining pieces 51 and 52, respectively, when the fastening members 54 are fastened to the retaining fitting 53. As a result, by simply fastening the ends of the first and second retaining pieces 51 and 52 of the retaining fitting 53 together with the fastening members 54 and 54, the ends of the first to third main reinforcement bars 11 to 13 can be firmly fixed while being aligned.

[0090] Furthermore, when the first to third main reinforcing bars 11 to 13 are screwed together by the screw fastening member 54 between the first retaining piece 51 and the second retaining piece 52, the contact between the first and second retaining pieces 514, 524 and the insertion piece 515 of the retaining fitting 53 and the respective contact pieces 514, 524 and insertion piece 515 of the first and second retaining pieces 51 and 52 allows each to be held in a more firmly pressed-together state.

[0091] Next, a fifth embodiment of the present invention will be described with reference to the drawings.

[0092] In this embodiment, the configuration of the main reinforcement connectors for each main reinforcement bundle 10 has been changed. Note that the other components, excluding the main reinforcement connectors, are the same as in the first embodiment; therefore, the same reference numerals are used for the same parts, and their detailed descriptions are omitted.

[0093] Figure 15 shows a perspective view of the main reinforcement connector in the state in which the main reinforcement is held, used in the main reinforcement connection structure according to the fifth embodiment of the present invention, and Figure 16 shows a perspective view of the main reinforcement connector in the state in which the main reinforcement is not held, as shown in Figure 15.

[0094] As shown in Figures 15 and 16, the main reinforcement connector 6 of each main reinforcement bundle 10 comprises a retaining fitting 65 having a first retaining piece 61 that extends in a straight line, and a second retaining piece 64 that is roughly V-shaped, with the inner ends of the first retaining piece 62 and the second retaining piece 63 bent at approximately 90° in the bent portion 640 in the longitudinal center, and a roughly U-shaped screwing member 66 having male threaded portions 661, 661 at both ends so as to be screwed onto the outer ends (both left and right ends in Figure 16) of the first and second retaining pieces 61, 64, respectively. In this case, the screwing member 66 is equipped with nuts 662, 662 that are screwed onto both male threaded portions 661, 661, respectively. The retaining fitting 65 is made of SS steel (rolled steel for general structural use).

[0095] The first retaining piece 61 is in contact with the first and third main reinforcing bars 11 and 13. The first retaining piece 61 is also provided with a pair of bent pieces 612, 612 that bend from both ends in its short direction and extend parallel to each other. At this time, the first and third main reinforcing bars 11 and 13 are spaced apart from each other and are in contact with the first retaining piece 61.

[0096] On the other hand, the second retaining piece 64 is in contact with the second main reinforcement 12 near the bent portion 640 and has first and second retaining piece portions 62 and 63 that extend linearly from the bent portion 640 in the tangential s direction of each hoop reinforcement 14 and in the normal h direction to the tangential s, respectively, so as to be in contact with the first or third main reinforcement 11 and 13. At this time, the first and second main reinforcement 11 and 12 are in contact with the first retaining piece portion 62 while in contact with each other in the tangential s direction of each hoop reinforcement 14, while the second and third main reinforcement 12 and 13 are in contact with the second retaining piece portion 63 while in contact with each other in the normal h direction to the tangential s of each hoop reinforcement 14.

[0097] The second retaining piece 64 is provided with bent plate pieces 641, 641 at both outer ends of the first and second retaining piece portions 62, 63, respectively, which are bent at approximately 135° from their respective outer ends so as to face the outer ends of the first retaining piece 61. In addition, the second retaining piece 64 and each bent plate piece 641 are provided with a pair of bent pieces 642, 642 that are bent from both ends in the short direction of the second retaining piece 64 and each bent plate piece 641 and extend parallel to each other.

[0098] Each bent plate piece 641 of the second retaining piece 64 is provided with an insertion hole 643 through which the male threaded portion 661 of the fastening member 66 is inserted. On the other hand, both outer ends of the first retaining piece 61 are also provided with insertion holes 644 through which each male threaded portion 661 of the fastening member 66 is inserted. The first retaining piece 61 and the second retaining piece 64 of the retaining fitting 65 are then screwed together by nuts 662, 662 from the surface side of the first retaining piece 61, with the two male threaded portions 661, 661 inserted through the insertion holes 644 at both outer ends of the first retaining piece 61 and through the insertion holes 643 in each bent plate piece 641 of the second retaining piece 64.

[0099] Furthermore, the retaining fitting 65 is provided with contact pieces 611, 611, respectively, which increase the contact area between the first and third main reinforcing bars 11, 13 and the first retaining piece 61 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connectors 6. In addition, the retaining fitting 65 is provided with insertion pieces 613, 613, respectively, which are inserted between the first and third main reinforcing bars 11, 13 and the first retaining piece 61 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connectors 6, thereby ensuring a spacing between the two main reinforcing bars 11, 13.

[0100] Each contact piece 611 is formed by the remaining portion of the first retaining piece 61, which has been cut out in a roughly semi-circular shape so that approximately half of the circumference of the first and third main reinforcement bars 11 and 13 fits into each bent piece 612 of the first retaining piece 61. This increases the contact area by contacting the periphery of the first and third main reinforcement bars 11 and 13 not only between the two main reinforcement bars 12 and 13 themselves, but also from the sides opposite the first and third main reinforcement bars 11 and 13.

[0101] Each insertion piece 613 is positioned to be inserted between two adjacent contact pieces 611, 611 of each contact piece 611, thereby ensuring a spacing between the main reinforcement bars 11, 13 by separating the two contact pieces 611, 611 from each other.

[0102] Furthermore, the retaining fitting 65 is provided with contact pieces 645 that increase the contact area between the first to third main reinforcing bars 11 to 13 and the second retaining piece 64 when the main reinforcing bar bundles 10 are connected by the main reinforcing bar connector 6. Each contact piece 645 is made up of the remaining portion of the second retaining piece 64 that is cut out in a roughly semi-circular shape so that approximately half of the circumference of the first and second main reinforcing bars 11, 12 and approximately half of the circumference of the second and third main reinforcing bars 12, 13 fits into each bent piece 642 of the second retaining piece 64. The contact pieces 645 contact the first and second main reinforcing bars 11, 12 and the second and third main reinforcing bars 12, 13 not only between the two main reinforcing bars 11, 12 (and 12, 13) but also from the opposite sides of the first and second main reinforcing bars 11, 12 and the opposite sides of the second and third main reinforcing bars 12, 13, thereby increasing the contact area.

[0103] Furthermore, the first and second retaining piece portions 62 and 63 of the second retaining piece 64 are provided with screw holes 671 and 671 into which bolt screws 67, 67 are screwed. The bolt screws 67 screwed into each screw hole 671 are inserted between the first and second main reinforcement bars 11, 12 and the second and third main reinforcement bars 12, 13, with their ends in contact with the two main reinforcement bars 11, 12 (and 12, 13).

[0104] Therefore, in this embodiment as well, each main reinforcement connector 6 includes a retaining fitting 65 having a linearly extending first retaining piece 61, and a substantially V-shaped second retaining piece 64 that extends linearly in the tangential s direction of each hoop reinforcement 14 and in the normal h direction to the tangential s, respectively, so as to contact the second main reinforcement 12 near the bent portion 640 and contact the first and third main reinforcement 11 and 13 from the bent portion 640, and a screwing member 66 for screwing nuts 662, 662 onto each male threaded portion 661 that is inserted through the insertion holes 643 of each bent plate piece 641 of the second retaining piece 64 of the retaining fitting 65 from each insertion hole 644 of the first retaining piece 61. The first to third main reinforcement 11 to 13 are held in a state of being pressed against the first and second retaining pieces 61 and 64, respectively, when the fastening member 66 is fastened to the retaining fitting 65. As a result, by simply fastening the ends of the first and second retaining pieces 61 and 64 of the retaining fitting 65 together with the fastening members 66, the ends of the first to third main reinforcement bars 11 to 13 can be firmly fixed while being aligned.

[0105] Furthermore, since the bolt threads 67 screwed into each screw hole 671 are inserted between the first and second main reinforcing bars 11,12 and the second and third main reinforcing bars 12,13, and their tips abut against both main reinforcing bars 11,12 (and 12,13), the holding force of the first and second main reinforcing bars 11,12 and the second and third main reinforcing bars 12,13 against the second retaining piece 64 becomes stronger. As a result, when the first retaining piece 61 and the second retaining piece 64 are screwed together by the screwing member 66, the first to third main reinforcing bars 11 to 13 can be held in a more firmly pressed state, in conjunction with the contact between the contact pieces 611,645 and the insertion piece 613 of the first and second retaining pieces 61 and 64 of the retaining fitting 65, and the abutment with the bolt threads 67.

[0106] Next, a sixth embodiment of the present invention will be described with reference to the drawings.

[0107] In this embodiment, the configuration of the main reinforcement connectors for each main reinforcement bundle 10 has been changed. Note that the other components, excluding the main reinforcement connectors, are the same as in the first embodiment; therefore, the same reference numerals are used for the same parts, and their detailed descriptions are omitted.

[0108] Figure 17 shows a perspective view from diagonally above of a main reinforcement connector used in a main reinforcement connection structure according to the sixth embodiment of the present invention, in a state where the main reinforcement is not held. Figure 18 shows a perspective view from diagonally below of the main reinforcement connector of Figure 17, and Figure 19 shows a side view of the main reinforcement connector of Figure 17 with the male threaded portion facing upwards. Furthermore, Figure 20 shows a bottom view of the main reinforcement connector of Figure 19 viewed from below, and Figure 21 shows a top view of the main reinforcement connector of Figure 19 in a state where the main reinforcement is held.

[0109] As shown in Figures 17 to 21, the main reinforcement connector 7 of each main reinforcement bundle 10 comprises a roughly V-shaped retaining fitting 73 in which the inner ends of the first retaining piece 71 and the second retaining piece 72 are curved at approximately 90° via a curved portion 70, and a roughly U-shaped screwing member 74 having male threaded portions 741, 741 at both ends so as to be screwed onto the outer ends (both left and right ends in Figure 21) of the first and second retaining pieces 71, 72, respectively. In this case, the screwing member 74 is equipped with nuts 742, 742 that are screwed onto the two male threaded portions 741, 741, respectively.

[0110] The retaining bracket 73 is formed from SS steel (rolled steel for general structural use). The first retaining piece 71 extends linearly in the tangential s direction of each hoop reinforcement 14 so as to be in contact with the first and second main reinforcements 11 and 12. At this time, the first and second main reinforcements 11 and 12 are in contact with each other in the tangential s direction of each hoop reinforcement 14 and are in contact with the first retaining piece 71.

[0111] On the other hand, the second retaining piece 72 is bent at approximately 90° from the inner end (right end in Figure 21) of the first retaining piece 71 so as to be in contact with the second and third main reinforcement bars 12 and 13, and extends linearly in the direction of the normal h direction to the tangent s of each hoop reinforcement bar 14. At this time, the second and third main reinforcement bars 12 and 13 are in contact with the second retaining piece 72 in a state where they are in contact with each other in the direction of the normal h direction to the tangent s of each hoop reinforcement bar 14.

[0112] Furthermore, the outer ends of the first and second retaining pieces 71 and 72 are provided with bent plate pieces 731 and 731 that are bent at approximately 135° from their respective outer ends so as to face the tip surfaces of the two male threaded portions 741 and 741 of the screw fastening member 74. The bottom portion 743 of the screw fastening member 74 extends in a straight line so as to be in contact with the first and third main reinforcement bars 11 and 13.

[0113] Each bent plate piece 731 is provided with a pair of bent pieces 733, 733 that bend from both ends in the short direction and extend parallel to each other, ensuring the rigid strength of each bent plate piece 731. Each bent plate piece 731 is also provided with an insertion hole 732 through which the male threaded portion 741 of the screw fastening member 74 is inserted. The retaining bracket 73 and the screw fastening member 74 are screwed together by screwing nuts 742, 742 from the back side of each bent plate piece 731 to the two male threaded portions 741, 741 that are inserted into the insertion hole 732 from the surface side of each bent plate piece 731 at the outer ends of the first and second retaining pieces 71, 72.

[0114] The screw-fastening member 74 is provided with an insertion piece 744 that, when the main reinforcement bundles 10 are connected by the main reinforcement connector 7, is inserted between the first and third main reinforcements 11 and 13 that are in contact with the first retaining piece 71, thereby ensuring a spacing between the two main reinforcements 11 and 13. This insertion piece 744 is formed in a flat shape and has a substantially semi-circular projection 745 in the center that protrudes towards the space between the first and third main reinforcements 11 and 13, and its base end is welded to the bottom 743 of the screw-fastening member 74.

[0115] Furthermore, the first to third main reinforcement bars 11 to 13 are held in a state of being pressed against the first retaining piece 71, the second retaining piece 72, and the bottom portion 743 of the screwing member 74, respectively, when the screwing member 74 is screwed onto the retaining fitting 73.

[0116] Therefore, in this embodiment as well, each main reinforcement connector 7 comprises a substantially V-shaped retaining fitting 73 having a first retaining piece 71 and a second retaining piece 72, and a substantially U-shaped screwing member 74 having a linearly extending bottom portion 743, which screws the male threaded portions 741, 741 at both ends to the bent plate pieces 731 of the first and second retaining pieces 71, 72 of the retaining fitting 73 by screwing nuts 742, 742 from the back side of each bent plate piece 731. The first to third main reinforcement bars 11 to 13 are held in a state of being pressed against the first retaining piece 71 and the second retaining piece 72 and the bottom portion 743 of the screwing member 74, respectively, when the screwing member 74 is screwed to the retaining fitting 73. As a result, the ends of the first to third main reinforcing bars 11 to 13 can be firmly fixed while aligning them, simply by screwing the two male threaded portions 741, 741 and nuts 742, 742 of the roughly U-shaped screwing member 74 onto the bent plate pieces 731 of the first and second retaining pieces 71, 72 of the retaining fitting 73.

[0117] Furthermore, since the protrusions 745 are inserted between both the first main reinforcement 11 and the third main reinforcement 13, and the insertion pieces 744 that ensure the spacing between the two main reinforcement 11 and 13 are provided on the bottom 743 of the screw member 74, the third main reinforcement 13 can be reliably positioned towards the center of each hoop reinforcement 14 while in contact with the second main reinforcement 12 in the direction of the normal h with respect to the tangent s of each hoop reinforcement 14, and the longitudinal movement of the first and third main reinforcement 11 and 13 in contact with each insertion piece 744 can be effectively restricted, thereby further increasing the rigidity strength of the reinforcing cage 1.

[0118] It should be noted that the present invention is not limited to the embodiments described above, but encompasses a variety of other modifications. In the embodiments described above, main reinforcement bundles 10, 10, ... are provided at eight locations on the circumferential direction of the reinforcing cage 1 at approximately equal intervals. However, the main reinforcement bundles may be provided at fewer than eight locations or nine or more locations on the circumferential direction of the reinforcing cage.

[0119] Furthermore, in each of the above embodiments, the lower end of the first main reinforcement 11 of each main reinforcement bundle 10 is brought into contact with the bottom surface of the pile hole, and the lower ends of the second and third main reinforcement 12 and 13 are joined to the upper end of the first main reinforcement to extend the reinforcing cage 1 in the longitudinal direction. However, when the reinforcing cage extends in the longitudinal direction by joining the lower ends of the first main reinforcement to the upper ends of the second and third main reinforcement of each main reinforcement bundle, the first to third main reinforcement may be connected by a main reinforcement connector. [Explanation of Symbols]

[0120] 1 Reinforcement cage 10 main muscle fascicles 11 1st main reinforcement 12 Second main reinforcement 13 Third main reinforcement 14 Hoop Muscles 2 Main reinforcement connectors 21 1st holding piece 22 Second holding piece 23 Retaining hardware 234,235 Contact piece 24 Threaded parts 243 Bottom 3. Main reinforcement connector 31 Retaining hardware 314 Contact piece 33 Screwing parts 4. Main reinforcement connector 41 1st holding piece 414 Contact piece 42 Second holding piece 424 Contact piece 425 Insertion piece 43 Retaining hardware 44 Threaded parts 5 Main reinforcement connectors 51 1st holding piece 514 Contact piece 515 Insertion piece 52 Second holding piece 520 Curved section 524 Contact piece 53 Retaining hardware 54 Threaded parts 6 Main reinforcement connector 61 1st holding piece 611 Contact piece 613 Insertion piece 62 Second holding piece 640 Bending section 645 Contact piece 65 Retaining hardware 66 Threaded parts 7 Main reinforcement connector 71 1st holding piece 72 Second holding piece 73 Retaining hardware 74 Threaded parts 743 Bottom 744 Insertion piece s Tangent to the hoop muscle h Normal to the tangent of the hoop reinforcement

Claims

1. In a reinforcing cage assembled in a cylindrical shape with multiple main reinforcing bars and multiple hoop reinforcing bars, a main reinforcing bar connecting structure is provided in which multiple bundles of main reinforcing bars, each bundled with the main reinforcing bars, are connected at intermediate positions in the longitudinal direction, at approximately equal intervals in the circumferential direction of the reinforcing cage. Each main reinforcement in each of the aforementioned main reinforcement bundles extends along the inside of each hoop reinforcement in the longitudinal direction of the reinforcement cage, and one end of one of the first main reinforcement and the other ends of two second and third main reinforcement are connected by a main reinforcement connector. The main reinforcement connecting structure for a reinforcing bar cage is characterized in that each main reinforcement connector is fixed in a state in which the first main reinforcement is positioned to be in contact with each hoop reinforcement together with the second main reinforcement at a tangent line and spaced apart from the third main reinforcement, and the second and third main reinforcement are fixed in a state in which they are in contact with each hoop reinforcement in a normal direction perpendicular to the tangent line to each hoop reinforcement.

2. Each of the aforementioned main reinforcement connectors is A substantially V-shaped retaining fitting having a first retaining piece that extends linearly in the tangential direction to each hoop reinforcement so as to be in contact with the first and second main reinforcements, and a second retaining piece that is bent from the inner end of the first retaining piece so as to be in contact with the second and third main reinforcements and extends linearly in the direction normal to the tangency of each hoop reinforcement, A substantially U-shaped screw-in member having a bottom portion that extends linearly so as to be in contact with the first and third main reinforcements, and having both ends screwed into the outer ends of the first and second retaining pieces of the retaining fitting, Equipped with, The main reinforcement connecting structure for a reinforcing cage according to claim 1, wherein the first to third main reinforcements are held in a state of being pressed against the first retaining piece, the second retaining piece, and the bottom, respectively, when the screwing member is screwed to the retaining fitting.

3. Each of the aforementioned main reinforcement connectors is A retaining bracket extending linearly in the direction normal to the tangent to each hoop reinforcement so as to be in contact with the second and third main reinforcements, A substantially L-shaped screw member is provided, with one end rotatably supported on the third main reinforcement side end of the retaining bracket, and the other end extending linearly in the tangential direction to each hoop reinforcement, around a part of the circumference of the first main reinforcement while in contact with the third main reinforcement, and screwed onto the second main reinforcement side end of the retaining bracket. Equipped with, The main reinforcement connecting structure for a reinforcing cage according to claim 1, wherein the first to third main reinforcements are held in a state of being pressed against the retaining fitting and the screwing member, respectively, when the screwing member is screwed to the retaining fitting.

4. Each of the aforementioned main reinforcement connectors is A retaining fitting having a first retaining piece extending linearly in the direction normal to the tangent to each hoop reinforcement so as to be in contact with the second and third main reinforcements, and a second retaining piece having one end of the first retaining piece rotatably supported on the third main reinforcement side end and extending linearly so as to be in contact with the first and third main reinforcements, A fastening member that extends linearly in the tangential direction to each of the hoop reinforcements and fastens the end of the first retaining piece on the second main reinforcement side and the other end of the second retaining piece, Equipped with, The main reinforcement connecting structure for a reinforcing cage according to claim 1, wherein the first to third main reinforcements are held in a state of being pressed against the first and second retaining pieces, respectively, when the fastening member is fastened to the retaining fitting.

5. Each of the aforementioned main reinforcement connectors is A retaining bracket having a first retaining piece that extends linearly so as to be in contact with the first and third main reinforcements, and a substantially V-shaped second retaining piece that extends linearly in the tangential direction of each hoop reinforcement and in the direction normal to the tangency, respectively, from a curved or bent portion that wraps around a part of the periphery of the second main reinforcement in the longitudinal center, so as to be in contact with the first and third main reinforcements, A fastening member that fastens the ends of the first retaining piece and the second retaining piece together, Equipped with, The main reinforcement connecting structure for a reinforcing cage according to claim 1, wherein the first to third main reinforcements are held in a state of being pressed against the first and second retaining pieces, respectively, when the fastening member is fastened to the retaining fitting.

6. The main reinforcement connecting structure for a reinforcing cage according to any one of claims 2 to 5, wherein the retaining fitting is provided with a contact piece that increases the contact area with at least one of the first to third main reinforcements that is in contact with the retaining fitting.

7. The main reinforcement connecting structure for a reinforcing cage according to any one of claims 2 to 5, wherein the retaining fitting or the screwing member is provided with an insertion piece that is inserted between both the first main reinforcement and the third main reinforcement to ensure a distance between the two main reinforcement bars.

8. The main reinforcement connecting structure for a reinforcing cage according to claim 6, wherein the retaining fitting or the screwing member is provided with an insertion piece that is inserted between the two main reinforcements so as to ensure a spacing between the first main reinforcement and the third main reinforcement.

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