JP2005042425A - Reinforced concrete structure laterally restrained reinforcing steel - Google Patents

Abstract

A laterally constrained reinforcing steel material having a reinforced concrete structure that is easy to construct and is less likely to deteriorate laterally constraining performance of a concrete cross section even during large deformation.
SOLUTION: Reinforcing bars 1 arranged in a transversely constrained reinforcing bar material 10 in a cross section of a reinforced concrete structure so as to intersect with constrained reinforcing bars 21 and 22 in the transverse section, and reinforcing bars 1 at an end 2 of the reinforcing bar 1 And a fixing plate 3 having a holding hole 4 at a position that is more than the diameter D0 of the restrained reinforcing bars 21 and 22 from the fixing part 8 of the reinforcing reinforcing bar 1 and one end portion that can be held in the holding hole 4 A rod-like member 11 having 12 is included. After the restrained reinforcing bars 21 and 22 are restrained by the fixing plate 3, the bar-shaped member 11 is mounted in the holding hole 4, and the restrained reinforcing bars 21 and 22 are restrained by the fixing plate 3, the reinforcing reinforcing bar 1, and the rod-shaped member 11. . Preferably, the holding hole 4 is a screw hole, and at least one end portion 12 of the rod-like member 11 is provided with a thread that can be fitted into the screw hole.
[Selection] Figure 1

Description

  The present invention relates to a laterally constrained reinforcing steel material having a reinforced concrete structure, and more particularly to a laterally constraining steel material that is disposed within a transverse section of a reinforced concrete structure and laterally restrains the cross-section concrete.

  Reinforced concrete (hereinafter simply referred to as RC) structures such as piers are arranged with axial reinforcing bars (main reinforcing bars) in the concrete and surrounding the axial reinforcing bars in the circumferential direction of the structural section. A bar rebar (strand) is arranged, and an intermediate rebar is arranged to penetrate the internal concrete cross section. For example, as shown in FIG. 4, the RC structure with a hollow cross section used for the piers of large-scale bridges, etc. is a cross section that forms a plastic hinge during an earthquake (a cross section that becomes non-linear when a non-linear response occurs during an earthquake. Decay progresses in some cases. First, the axial rebar on the tensile side yields and reaches maximum yield strength, then the collapse of the covered concrete gradually progresses, and finally the internal concrete collapses after the axial rebar buckles. The band rebar and the intermediate band reinforce the function of preventing the buckling of the axial rebar and increasing the lateral restraint of the internal concrete. Even if strain exceeding the yield point occurs in the axial rebar on the tension side, if the buckling of the axial rebar and the collapse of the internal concrete can be prevented, tenacious plastic deformation performance can be obtained and the toughness of the RC structure can be increased. it can.

  FIG. 5 shows a bar arrangement example of the band rebar 24 and the intermediate band rebar 25 in the rectangular cross section of the RC structure. The strip reinforcement 24 that surrounds the axial rebar 23 is placed at an appropriate axial interval (for example, an interval of 150 mm or less) that can suppress buckling of the axial rebar 23. A hook 24a or the like is provided at the end so as to be surely restrained and fixed to the internal concrete. Further, the intermediate band reinforcing bars 25 arranged inside the cross section are arranged at an appropriate interval in the cross section (for example, an interval of 1 m or less) so that the buckling of the axial reinforcing bar 23 and the protruding of the band reinforcing bar 24 can be effectively suppressed. Then, hooks 25a and the like are provided at the ends so that the concrete cross section can be reliably restrained and locked to the belt reinforcing bar 24 and fixed to the internal concrete. From the viewpoint of preventing the buckling of the axial rebar 23, it is effective to lock the hook 25a of the intermediate rebar 25 to the axial rebar 23 together with the rebar 24 (see Non-Patent Document 1). The band rebar 24 and the intermediate band rebar 25 also function as shear reinforcement bars for the RC structure.

  In order to secure the RC structure with high toughness that can withstand a large earthquake such as the Kobe Nanbu Earthquake, it is necessary to densely arrange the intermediate zone rebar 25 in the RC structure. However, the conventional intermediate band rebar 25 is formed by hooking the end of the rod-shaped rebar into a hook, acute angle or semicircular shape to form a hook 25a, and the hook 25a is connected to the axial rebar 23 / band rebar 24. Since it settles by stopping, construction takes time. The hook 24a is not only labor-intensive, but it is difficult to reduce its diameter, especially when densely arranged, complicated arrangements such as assembling in a complex order including the axial rebar 23 and belt rebar 24 Construction is required.

  For the purpose of improving the efficiency and rationalization of RC bar arrangement, a method using a reinforcing bar with a fixing portion at the end instead of the conventional hooks 24a and 25a has been proposed. For example, Patent Document 1 discloses a hot upsetting in which a partial region (for example, an end portion) in the axial direction of a reinforcing bar is heated to a temperature at which plastic deformation is easy, and the heating region is compressed in the axial direction to be plastically deformed radially outward. Disclosed is a reinforcing bar with a fixing portion in which an enlarged diameter portion is formed by processing. The shape and size of the outer peripheral surface of the enlarged diameter portion are adjusted using an appropriate die during hot upsetting, and the size of the enlarged diameter portion is adjusted by adjusting the amount of compression of the reinforcing bar. In Patent Document 2 and Non-Patent Document 2, as shown in FIG. 7, a fixing plate (holding plate) 3 for fixing the reinforcing bar 1 to the axial bar 23 by a friction welding method or a nut is fixed to the end of the reinforcing bar 1. A rebar 28 with a fixing plate is disclosed. The friction welding method is a method in which the fixing plate 3 is relatively rotated at a high speed and pressed against the end of the reinforcing reinforcing bar 1 and both are joined by frictional heat generated at that time. A reinforcing bar with a fixing part (fixing plate) formed by hot upsetting or friction welding has an advantage that the diameter of the fixing part (fixing plate) can be made considerably smaller than a semicircular hook having the same reinforcing bar diameter.

  Patent Document 3 proposes an RC pier structure using a reinforcing bar with a fixing plate as an intermediate band reinforcing bar 25 as shown in FIG. The RC pier structure shown in the figure penetrates through an intermediate band reinforcing bar 25 in which a fixing plate 3 is attached to one end or both ends of a reinforcing reinforcing bar composed of an axial reinforcing bar 23 and a band reinforcing bar 24 depending on the bar arrangement situation and workability. Reinforce with. For example, as shown in FIG. 9, the intermediate band rebar 25 with the fixing plate is inserted into the gap between the reinforcing reinforcing bars after the hook 10 (or the fixing plate 3) at one end is inserted into the specific reinforcing bar 24 (or the axial direction). Since the fixing plate 3 at the other end can be locked to the corresponding band reinforcing bar 24 (or the axial reinforcing bar 23) by being locked to the reinforcing bar 23) and rotating around the locking end, it is efficient. Reasonable construction is possible. FIG. 6 shows a cross section of the structure in which the internal concrete is laterally restrained in combination with the steel pipe body 27 as well as the intermediate band rebar 25.

JP 2000-257209 A JP-A-10-196120 JP 2003-183040 A Japan Road Association "Road Bridge Specification (V Seismic Design) / Commentary" pp169-175, Revised March 7, 2002 VSL Japan Co., Ltd. “Technical data on plate-fixed shear reinforcing bar Head-bar” October 2001

  However, it is difficult to apply the intermediate band rebar 25 with the fixing plate of Patent Document 3 alone to the plastic hinge cross section of the RC structure without combining the steel pipe body 27. FIG. 8 is a deformation prediction diagram when the intermediate band reinforcing bar 25 with the fixing plate is applied to the cross section of the plastic hinge. In the plastic hinge section, it is necessary to keep in mind that the covering concrete is peeled off as shown in FIG. When the covering concrete is peeled off, the intermediate band rebar 25 with the fixing plate is in a cantilever state, and if this state prevents the band rebar 24 from protruding, the reinforcing rebar 1 of the intermediate band rebar 25 becomes as shown in FIG. There is a possibility that the reinforcing rebar 1 is deformed by the action of a shearing force greater than the shear strength, and the band reinforcing bar 24 comes out of the restraint of the intermediate band reinforcing bar 25 as shown in FIG. That is, the RC structure using the intermediate band reinforcing bar 25 with the fixing plate has a concern that the plastic deformation performance deteriorates at the end of the time when the covered concrete is peeled off.

  Further, the reinforcing bar 28 with fixing plate of Patent Documents 1 and 2 is also effective as a general shear reinforcing bar, but in order to use it as an intermediate band reinforcing bar 25 such as a plastic hinge section, the covering concrete is peeled off. However, it is necessary to add a function that the fixing plate 3 can reliably restrain the rebar 24. The shear reinforcement bars function so long as they are arranged so as to intersect oblique cracks generated in the RC member and are anchored in the concrete so as to hold the concrete blocks generated by the cracks. On the other hand, it is not sufficient for the intermediate band reinforcing bar 25 such as a plastic hinge section to be fixed in the concrete, and the protrusion of the band reinforcing bar 24 can be suppressed, and the concrete section must be able to be restrained laterally.

  Patent Document 2 proposes a fixing plate 3 provided with a rib 3a as shown in FIG. 7C for the purpose of preventing the fixing plate 3 and the axial rebar 23 from shifting. However, if the fixing plate 3 is provided with the rib 3a, the rib 3a becomes an obstacle when the fixing plate 3 is attached to the axial rebar 23 while rotating, as shown in FIG. Will be lost. Reinforcement material that has the same lateral restraint performance of internal concrete as that of conventional hooks, etc., without deteriorating the restraint performance of band rebar 24 even when covering concrete is peeled off while ensuring ease of construction and rationality. Development is desired.

  Accordingly, an object of the present invention is to provide a laterally constrained reinforcing bar material having a reinforced concrete structure that is easy to construct and is less likely to deteriorate the laterally constraining performance of a concrete section even during large deformation.

  Referring to the embodiment of FIG. 1, a reinforced concrete structure laterally constrained reinforcing bar material according to the present invention includes a reinforcing reinforcing bar 1 and an end of a reinforcing reinforcing bar 1 arranged to intersect with constrained reinforcing bars 21 and 22 in a cross section of the reinforced concrete structure. The fixing plate 3 having a holding hole 4 at a portion fixed to the portion 2 in a direction intersecting with the reinforcing reinforcing bar 1 and separated from the fixing portion 8 of the reinforcing reinforcing bar 1 by a diameter D0 of the restrained reinforcing bars 21 and 22, and the holding hole 4 It is provided with a rod-like member 11 having an end portion 12 that can be held on the rod.

  Preferably, the holding hole 4 is a screw hole, and at least one end portion 12 of the rod-like member 11 is provided with a screw thread that can be fitted into the screw hole. More preferably, as shown in FIG. 2B, the holding hole 4 is a through-hole through which the rod-shaped member 11 can penetrate, and the one end portion 12 of the rod-shaped member 11 is an enlarged diameter portion that can be coupled to the through-hole. As shown in FIG. 5A, a protruding portion 14 directed to the reinforcing bar 1 is provided at the other end of the bar-shaped member 11, or the other end of the bar-shaped member 11 is connected to the reinforcing bar 1 as shown in FIG. It can be bent.

  The laterally constrained reinforcing bar material of the reinforced concrete structure according to the present invention is provided with the holding hole 4 in the fixing plate 3 fixed to the end portion 2 of the reinforcing reinforcing bar 1, and after restraining the restrained reinforcing bars 21 and 22 in the fixing plate 3, Since it is attached in the holding hole 4 and the restrained reinforcing bars 21 and 22 are restrained by the three members of the fixing plate 3, the reinforcing reinforcing bar 1 and the rod-like member 11, the following remarkable effects are obtained.

(A) Since the restrained reinforcing bar is fixed so as to be surrounded by the fixing plate, the reinforcing reinforcing bar, and the rod-like member, the restrained reinforcing bar can be reliably restrained even when it is largely deformed during an earthquake or the like.
(B) Even if the concrete covered with the fixing plate is peeled off, the restrained reinforcing bars can be securely restrained, so that the lateral restraint performance of the concrete section can be maintained until the end of the earthquake.
(C) Since the bar-shaped member is attached after the restrained reinforcing bar is constrained to the fixing plate, the bar-shaped member does not become an obstacle at the time of bar arrangement, and the efficiency and rationalization of the bar arrangement can be achieved.
(D) When densely arranged, rational and efficient arrangement is possible without being restricted by the rebar assembly order, which can contribute to shortening the construction period and reducing costs.
(E) The thickness and size of the fixing plate and the diameter and length of the rod-shaped member can be appropriately selected so that the reinforcing effect equal to or higher than that of the conventional hooked reinforcing bar can be obtained.
(F) Since the rod-shaped member can be held without protruding to the covered concrete side, a covering concrete thickness equivalent to that of a conventional hooked reinforcing bar is sufficient.
(G) A conventional reinforcing bar with a fixing plate can be used for manufacturing easily by providing a holding hole, and the function of the conventional reinforcing bar with a fixing plate can be effectively improved.
(H) It can be applied to intermediate zone rebars such as plastic hinge sections that are greatly deformed during earthquakes, and in particular, can contribute to improving the toughness of RC structures such as road piers.

  The laterally constrained reinforcing bar material 10 of the present invention can be applied to various cross sections to be laterally constrained with RC structure concrete, but FIG. 1 shows an embodiment applied to an intermediate band rebar 25 such as a plastic hinge section of an RC structure. . In the illustrated example, the laterally constrained reinforcing bar material 10 includes a reinforcing bar 1 arranged in an RC cross section, a fixing plate 3 with holding holes 4 fixed to both ends 2 thereof, and a rod-like member that can hold one end 12 in the holding hole 4. 11 and. In this case, the reinforcing reinforcing bars 1 of the laterally constrained reinforcing bars 10 which are intermediate band reinforcing bars 25 are arranged in a direction intersecting with the constrained reinforcing bars 21 and 22 which are a pair of opposing band reinforcing bars 24 in the RC cross section in this case. 2 fixing plates 3 are locked to the restrained reinforcing bars 21 and 22, respectively. However, according to the bar arrangement situation and workability, it can be set as the laterally-restricted reinforcing bar material 10 in which the fixing plate 3 is fixed only to one end of the reinforcing steel bar 1, for example, as shown in FIG. The hook 9 may be formed at the end, or two sets of laterally restrained reinforcing bars 10 may be joined to form the intermediate band reinforcing bar 25 in the illustrated example.

  The fixing plate 3 is provided with a locking surface 6 that locks the restrained reinforcing bars 21 and 22 and a holding hole 4 that holds the rod-shaped member 11 on the locking surface 6. Further, the end 2 of the reinforcing reinforcing bar 1 is fixed in a direction intersecting with the locking surface 6 at a portion 8 separated from the holding hole 4 on the locking surface 6 by a distance H as shown in FIG. The fixing plate 3 and the reinforcing reinforcing bar 1 can be fixed in advance in a factory or the like by hot upsetting or friction welding, for example, as disclosed in Japanese Patent Application No. 2003-043817 by the inventors. May be fixed on site. In the illustrated example, the fixing plate 3 is a rectangular plate, and the holding hole 4 and the fixing portion 8 of the reinforcing reinforcing bar 1 are respectively provided at the opposing edge portions of the fixing plate 3. However, the shape of the fixing plate 3 is not limited to the illustrated example. The fixing plate 3 can be made compact by cutting away unnecessary portions in consideration of the moment distribution and the like.

  The rod-like member 11 is provided with one end portion 12 that can be held in the holding hole 4 of the fixing plate 3 (see FIG. 1C). For example, the holding hole 4 is a screw hole, and at least one end portion 12 of the rod-like member 11 is provided with a thread that can be fitted into the screw hole, and the rod-like member 11 is locked by screwing the one end portion 12 into the holding hole 4. The other end 13 of the rod-shaped member 11 is protruded from the locking surface 6 while being held on the surface 6. As the rod-shaped member 11, a threaded reinforcing bar or the like in which a screw thread is entirely formed may be used. However, the holding hole 4 is sufficient if it can hold the one end 12 of the rod-like member 11, and the one end 12 of the rod-like member 11 can be held in the holding hole 4 with an appropriate adhesive or the like. In the illustrated example, the holding hole 4 is a through hole in the thickness direction of the fixing plate 3, but it is not necessary to penetrate the holding hole 4 as long as a depth that can prevent the rod-like member 11 from coming out can be secured. When the holding hole 4 is a through-hole, if the rod-like member 11 protrudes on the surface opposite to the locking surface 6 (concrete covering side), an unreasonable increase in covering concrete thickness or the like is caused. It is preferable that the one end portion 12 is made to have a size (length) equal to or less than the thickness of the fixing plate 3 so as to avoid the protrusion of the rod-shaped member 11 toward the concrete covering side.

  When the distance H between the fixing portion 8 of the reinforcing reinforcing bar 1 on the fixing plate 3 and the holding hole 4 is set to be not less than the diameter D0 of the restrained reinforcing bars 21 and 22, and the rod-like member 11 is held in the holding hole 4, the fixing plate 3 The restrained reinforcing bars 21 and 22 can be restrained between the upper reinforcing bar 1 and the rod-shaped member 11. The constrained reinforcing bars 21 and 22 can be constrained so as to be surrounded by the fixing plate 3, the reinforcing steel bar 1 and the rod-shaped member 11, and even if the covering concrete is peeled off as shown in FIG. The protruding of the restraining reinforcing bars 21 and 22 can be suppressed. Preferably, the distance H is selected so that the distance between the reinforcing reinforcing bar 1 and the rod-shaped member 11 is substantially equal to the diameter D0 of the restrained reinforcing bars 21 and 22, and the fixing plate 3 and the reinforcing reinforcing bar are selected. The restrained reinforcing bars 21 and 22 can be fitted into a space defined by the three members 1 and the rod-shaped member 11. By this fitting, the constrained reinforcing bars 21, 22 can be integrated with the laterally constrained reinforcing bar material 10, and the constrained reinforcing bars 21, 22 are securely restrained even at the end of the earthquake, and against the RC structure that deforms greatly Can provide sufficient toughness.

  The length (the length of the other end 13 protruding from the holding hole 4) L and the diameter (thickness) D1 of the rod-shaped member 11 are selected, for example, experimentally so that the restrained reinforcing bars 21 and 22 can be reliably restrained. it can. Preferably, the bar-shaped member 11 has a length L that is equal to or greater than the diameter D0 of the restrained reinforcing bars 21 and 22, and the bar-shaped member 11 is given a shear strength equivalent to that of the reinforcing reinforcing bar 1. The rod-like member 11 may be made of the same material and the same diameter as the reinforcing reinforcing bar 1, but when different materials are used, the diameter of the rod-like member 11 can be selected so that the shear strength is comparable. By making the length L of the bar-shaped member 11 equal to or greater than the diameter D0 of the restrained reinforcing bars 21 and 22, and making the shear strength of the bar-shaped member 11 and the reinforcing reinforcing bar 1 comparable, a uniform restraining effect on the restrained reinforcing bars 21 and 22 can be obtained. can get. More preferably, the rod-like member 11 has a length that can be fixed to the internal concrete having an RC cross section. If the rod-like member 11 is fixed to the internal concrete, a lateral restraint performance equal to or higher than that of the conventional reinforcing bar 25 with the hook 25a for fixing the hook 25a to the internal concrete as shown in FIG. 5 can be expected.

  When arranging the laterally-restricting reinforcing bar material 10 in the illustrated example, first, the bar-shaped member 11 is not held on the fixing plate 3 in the same manner as the conventional reinforcing bar with fixing plate described above with reference to FIG. Then, the fixing plates 3 at both end portions 2 of the laterally restrained reinforcing bar material 10 are engaged with the restrained reinforcing bars 21 and 22. Next, the rod-like member 11 is attached to the holding hole 4 while restraining the restrained reinforcing bars 21 and 22 with the locking surface 6 of the fixing plate 3. In order to prevent misalignment or the like, the rod-shaped member 11 may be attached after the fixing plate 3 and the restrained reinforcing bars 21 and 22 are aligned with a binding line or the like. The rod-like member 11 can be attached to the holding hole 4 from the fixing surface 6 side of the fixing plate 3 as shown in FIG. 2A, for example, but the holding hole 4 is attached to the rod-like member 11 as shown in FIG. If the end portion 12 of the rod-shaped member 11 is a diameter-enlarged portion (diameter D2 of the one end portion 12> diameter D1 of the other end portion 13) that can be coupled to the through hole, the engagement of the fixing plate 3 It is also possible to attach to the holding hole 4 from the side opposite to the stop surface 6 (concrete covering side). Since the bar-shaped member 11 can be constructed relatively easily, the laterally constrained reinforcing bar material 10 can be arranged with the same working efficiency as a conventional reinforcing bar with a fixing plate. In addition, even when the laterally constrained reinforcing bar material 10 is densely arranged, rational and efficient construction that is not restricted by the rebar assembling order is possible.

  In this way, it is possible to provide “a laterally restrained reinforcing bar material having a reinforced concrete structure that is easy to construct and is less likely to deteriorate the laterally restraining performance of the concrete section even during large deformation”, which is an object of the present invention.

  FIG. 2A shows an embodiment of the present invention in which a protruding portion 14 directed to the reinforcing bar 1 is provided at the other end of the bar-shaped member 11, and FIG. 2C shows the other end of the bar-shaped member 11 at the reinforcing bar 1. The example bent toward the side is shown. As described above, in the present invention, the restrained reinforcing bars 21 and 22 can be restrained so as to be surrounded by the fixing plate 3, the reinforcing reinforcing bar 1, and the bar-shaped member 11, but the other end of the bar-shaped member 11 is directed to the reinforcing bar 1. By providing the protruding portion 14 and the bent portion, it is possible to improve the integrity of the restrained reinforcing bars 21 and 22 and the laterally restrained reinforcing bar material 10 and to improve the lateral restraining performance with respect to the restrained reinforcing bars 21 and 22.

  FIG. 2D shows an embodiment of the present invention in which a bridging member 30 is provided between the other end portion of the rod-shaped member 11 and the reinforcing steel bar 1 so as to run in parallel with the fixing plate 3. The bridging member 30 in the illustrated example has coupling holes 31 and 32 separated by a distance H between the fixing portion 8 on the fixing plate 3 and the holding hole 4, and the coupling holes 31 and 32 are connected to the reinforcing rebar 1 and the rod-shaped member 11. And the other end of each of the two are connected in parallel with the fixing plate 3. By attaching the bridging member 30 of the illustrated example, the restrained reinforcing bars 21 and 22 can be restrained by the four members of the fixing plate 3, the reinforcing reinforcing bar 1, the rod-like member 11, and the bridging member 30. And the laterally constrained reinforcing bar 10 can be more reliably integrated.

  FIG. 3 shows another embodiment of the laterally constrained reinforcing bar material 10 of the present invention that can be applied to a plastic hinge cross section of an RC structure. In the illustrated example of the laterally constrained reinforcing bar 10, a fixing plate 3 in which a rod-like member 11 is pivotally supported at an end edge 15 is used instead of the fixing plate 3 with the holding hole 4 in FIGS. 1 and 2. That is, an end edge 15 is provided on the fixing plate 3 at a distance H from the fixing portion 8 of the reinforcing reinforcing bar 1, and a pivot pin 16 is provided on the end edge 15 to pivotally support the rod-shaped member 11. The diameter D1 of the rod-shaped member 11 is set to be equal to or less than the thickness d of the end edge portion 15 of the fixing plate 3, a radial rotation shaft hole 18 is provided at one end portion of the rod-shaped member 11, and the end edge portion 15 is formed in the rotation shaft hole 18. Pivot to pivot pin 16.

  3 has a positioning mechanism 17 that can switch the rotation angle position of the rod-shaped member 11 between a parallel position parallel to the fixing plate 3 and an intersecting position. The positioning mechanism 17 in the illustrated example includes positioning protrusions 17a, 17b, and 17c. The positioning protrusions 17a and 17b position the rod-shaped member 11 at the cross position, and the positioning protrusions 17b and 17c position the rod-shaped member 11 at the parallel position (same as above). (Refer figure (C)). In the illustrated example, the rod-shaped member 11 is positioned at a right-angle position orthogonal to the fixing plate 3 by the positioning protrusions 17a and 17b. However, the structure of the positioning mechanism 17 is not limited to the illustrated example.

  When the distance H between the fixing portion 8 on the fixing plate 3 and the edge 15 is set to be equal to or larger than the diameter D0 of the restrained reinforcing bars 21 and 22, and the rod-shaped member 11 is positioned at the crossing position (or the right angle position) by the positioning mechanism 17. Further, the restrained reinforcing bars 21 and 22 can be restrained by the three members of the fixing plate 3, the reinforcing reinforcing bar 1 and the rod-like member 11. When arranging the bars, first, the rod-like member 11 is positioned at the parallel position by the positioning mechanism 17, and in the same manner as in the above-described embodiment of FIG. Is locked to the restrained reinforcing bars 21 and 22. Next, the rod-shaped member 11 is positioned to the crossing position (or the right-angled position) by the positioning mechanism 17 while restraining the restrained reinforcing bars 21 and 22 with the locking surface 6 of the fixing plate 3.

  3 can be arranged with work efficiency substantially the same as that of a conventional reinforcing bar with a fixing plate, and rational and efficient construction that is not restricted by the assembling order of the reinforcing bars is possible. . In addition, the restrained reinforcing bars 21 and 22 can be restrained so as to be surrounded by the fixing plate 3, the reinforcing reinforcing bar 1 and the rod-shaped member 11, and the restrained reinforcing bars are also provided at the end of the earthquake when the covered concrete is peeled off. The protrusion of 21 and 22 can be reliably prevented. 3 can be combined with the bridging member 30 of FIG. 2D, and the restrained reinforcing bar 21 is composed of the fixing plate 3, the reinforcing bar 1, the rod-like member 11, and the bridging member 30. , 22 can be restrained, and the constrained reinforcing bars 21, 22 and the laterally constrained reinforcing bar material 10 can be reliably integrated.

It is explanatory drawing of one Example of this invention. It is explanatory drawing of the other Example of this invention. It is explanatory drawing of other Example of this invention. It is explanatory drawing which shows an example of the collapse progress situation of RC structure. It is an example of a single reinforcing bar and a middle reinforcing bar in a conventional RC structure. It is explanatory drawing of the RC structure using the conventional reinforcing bar with a fixing plate. It is explanatory drawing of the conventional reinforcing bar with a fixing plate. It is a deformation | transformation prediction figure at the time of the earthquake of the reinforcing bar with a fixing plate of FIG. It is explanatory drawing of the fixing method of the reinforcing bar with a fixing plate of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Reinforcing bar 2 ... End part 3 ... Fixing plate 4 ... Holding hole 6 ... Locking surface 8 ... Fixing part 9 ... Hook 10 ... Side restraint reinforcing bar material
11 ... Rod-shaped member 12 ... One end (fitting part)
13 ... other end 14 ... expanded diameter part
15 ... edge 16 ... pivot pin
17 ... Positioning mechanism
17a, 17b, 17c ... Positioning protrusion
18 ... Rotating shaft hole
21,22 ... Restrained reinforcing bars
23… Axial rebar 24… Strip rebar
25 ... intermediate zone reinforcement 26 ... concrete
27 ... Steel pipe body 28 ... Rebar with anchor plate
30 ... Bridge member 31, 32 ... Bonding hole

Claims (9)

Reinforcing bars that are placed in the cross section of the reinforced concrete structure so as to intersect with the restrained reinforcing bars, fixed to the ends of the reinforcing bars in a direction that intersects with the reinforcing reinforcing bars, and separated from the fixing reinforcement by the diameter of the restrained reinforcing bars A laterally constrained reinforcing bar material having a reinforced concrete structure, comprising a fixing plate having a holding hole at the portion and a rod-like member having one end portion that can be held in the holding hole. The reinforcing bar material according to claim 1, wherein the holding hole is a screw hole, and a thread that can be fitted to the screw hole is provided at least at one end of the rod-shaped member. The reinforcing bar material according to claim 1 or 2, wherein the holding hole is a through-hole through which a rod-shaped member can penetrate, and one end portion of the rod-shaped member is used as an enlarged diameter portion that can be coupled to the through-hole. . 3. A reinforcing bar material having a reinforced concrete structure according to claim 1 or 2, wherein a projecting portion directed to a reinforcing steel bar is provided at the other end of the bar-shaped member. 3. A reinforcing bar material having a reinforced concrete structure according to claim 1, wherein the other end of the rod-shaped member is bent toward the reinforcing bar. Reinforcing bars that are placed in the cross section of the reinforced concrete structure so as to intersect with the restrained reinforcing bars, fixed to the ends of the reinforcing bars in a direction that intersects with the reinforcing reinforcing bars, and separated from the fixing reinforcement by the diameter of the restrained reinforcing bars A fixing plate having a curved edge, and a pivot that pivotally supports a rod-like member having a diameter equal to or smaller than the thickness of the edge and having a radial rotation shaft hole at one end. A laterally constrained reinforcing steel member having a reinforced concrete structure comprising a pin and a positioning mechanism capable of switching a rotational angle position of the rod-shaped member between a parallel position parallel to the plate and an intersecting position. The reinforcing bar material according to any one of claims 1 to 6, wherein the bar-shaped member has a length capable of being fixed to the concrete inside the transverse section. The reinforcing bar material according to any one of claims 1 to 7, wherein the bar-shaped member is provided with a shear strength equivalent to that of the reinforcing reinforcing bar, and has a reinforced concrete structure. 9. The reinforcing bar material having a reinforced concrete structure according to claim 1, wherein a bridging member is provided between the other end portion of the rod-shaped member and the reinforcing reinforcing bar in parallel with the fixing plate.