JP2013040485A - Load support and support body joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load support and support body joint structure for effectively preventing the deformation of joint rings by transmitting a load from a main reinforcement via a load transmission member to wide regions of the pair of joint rings in a distributive manner, and for simplifying work for loading the load transmission member.SOLUTION: In a joint structure 30, a bar-like load transmission rod 44 is arranged inside a connection hook part 28 of an intersection main reinforcement 20 held between a pair of joint rings 32, 34 so as to be inserted through the inner periphery sides of a pair of base ring parts 36. Thus, a load from the intersection main reinforcement 20 is transmitted via the load transmission rod 44 to the pair of joint rings 32 in an almost equally distributive manner, and is also transmitted via the pair of joint rings 32, 34 to a connection reinforcement group 58 of an RC column 16. As a result, the pair of joint rings 32, 34 are effectively prevented from being locally deformed.

Description

  The present invention relates to a joint structure between a load support body and a support body that joins a reinforced concrete load support body constituting a beam, a floor, and the like in a structure such as a viaduct to a support body having an RC (Reinfoced-Concrete) structure.

  As a joint structure between a load support body and a support body applied to various reinforced concrete structures, for example, those described in Patent Document 1 and Patent Document 2 are known. Patent Document 1 describes a joining structure of a flat slab composed of a steel pipe column and reinforced concrete. In this joining structure, the steel pipe column is supported so as to be surrounded by two positions, a slab lower surface position and a slab upper surface position. The pressure plates are joined, and each of the pressure plates protrudes to the slab side to such an extent that a bending moment caused by an external force in the horizontal direction can be transmitted. Further, in the joint structure described in Patent Document 1, the tip portion of the slab rebar disposed near the steel pipe column is bent into a hook shape (J shape), and one ring-shaped member surrounds the steel pipe column. It arrange | positions and it arrange | positions so that the front-end | tip part of the reinforcing bar bent in the hook shape may hook a ring-shaped member.

  Patent Document 2 describes a joint structure between a reinforced concrete beam and a pile. The joint structure includes a pair of upper and lower fixing rings loosely fitted around a steel pipe pile, and the pair of fixing rings. And a fixing plate having a T-shaped cross section sandwiched between them, and a main reinforcing bar is connected by welding to the end of the fixing plate that protrudes between the pair of annular members toward the outer peripheral side. It has become.

JP 2000-160685 A (FIGS. 10 and 11, paragraphs [0029] to [0031]) JP 2001-342684 A (FIG. 2, paragraphs [0023] to [0027])

  In the joint structure described in Patent Document 1, the tip portion of the main reinforcing bar bent in a J-shape is disposed so as to be hooked on one ring-shaped member, and the load from the main reinforcing bar is transmitted to the ring-shaped member. The load is transmitted to the steel pipe column and other main reinforcing bars through the member. However, when such a structure is adopted, the load from the main rebar concentrates in a narrow area in the ring-shaped member, and when a large load acts on a building including a flat slab, the ring shape is formed in the slab. There is a risk of local deformation of the member.

Further, in the joint structure described in Patent Document 2, the tip of the main reinforcing bar must be connected to the end of the fixing plate sandwiched between the pair of fixing rings by welding or the like at the construction site. It becomes annoying.
The object of the present invention is to effectively prevent deformation of the annular member by dispersing the load transmitted from the main rebar through the load transmission member and transmitting it to a wide area of the annular member in consideration of the above fact, Another object of the present invention is to provide a joint structure between a load support body and a support body that can simplify the loading operation of the load transmission member.

  According to the first aspect of the present invention, a structure for joining a load support body and a support body is embedded in a reinforced concrete load support body including a plurality of main reinforcing bars, a concrete forming column, and the concrete forming column. And a reinforced concrete column body comprising a column main reinforcing bar group composed of a plurality of reinforcing bars arranged to extend in the axial direction. It is a joining structure for joining a body to the pillar body, and a part of the column main reinforcing bar group is provided to protrude from the concrete forming pillar along the axial direction, and is embedded in the load support body. A connecting reinforcing bar group, a hook-like connecting hook part provided at each end of a plurality of main reinforcing bars extending from the outer peripheral side to the center side of the connecting reinforcing bar group of the load support, and the connecting reinforcing bar Arranged on the outer periphery of the group And a pair of annular members embedded in the inside of the load support body together with the connection reinforcing bar group and sandwiching a tip end side including the connection hook portion in the main reinforcement of the load support body, and a pair of the annular members And a load transmission member disposed so as to be inserted through the inner peripheral side of the pair of annular members inside the connecting hook portion sandwiched between the pair of annular members.

  In such a joint structure between the load support body and the support body, the load transmitting member is inside the connecting hook portion provided at the tip of the main reinforcing bar sandwiched between the pair of annular members, By being arranged so as to be inserted through the inner peripheral side of the annular member, the load (compression load or tensile load) from the main rebar is interposed between the connecting hook portion and the pair of annular members and the load transmission. In addition to being able to transmit to the pair of annular members through the members, the pair of annular members, the column main reinforcing bars, and the concrete layer interposed between them can be transmitted to the column body.

At this time, if the projected area of the load transmission member on the pair of annular members along the transmission direction of the load transmitted from the main reinforcing bar is larger than the projected area of the main reinforcing bar on the pair of annular members, such load transmission is performed. Compared to the case where the main rebar is joined to the annular member without using a member, the load from the main rebar can be evenly distributed and transmitted to a wide area of the pair of annular members via the concrete layer and the load transmitting member. It is possible to effectively prevent the annular member from being locally deformed by the transmission load from the main reinforcing bar.
Therefore, it is possible to effectively prevent the annular member from being locally deformed due to the transmission load from the main reinforcing bar, so that the transmission efficiency of the load transmitted from the main reinforcing bar to the column body is reduced along with the deformation of the annular member. Can be effectively prevented.

  Further, before or during the placement of the concrete forming the concrete molding, the load transmitting member is located inside the connecting hook portion formed at the tip of the main reinforcing bar, and the inner peripheral side of the pair of annular members The load transmission member can be loaded into the main hook connecting hook simply by placing it so that it can be inserted, making it very easy to load the load transmission member that transmits the load between the main reinforcement and the pair of annular members. Can be.

Moreover, the joint structure of the load support body and the support body according to the second aspect of the present invention is the joint structure of the load support body and the support body of the first aspect, wherein the annular member is formed in an annular shape by a steel material. It is preferable that a rib-shaped diaphragm portion is joined to at least one of the inner peripheral surface and the outer peripheral surface of the base ring portion.
Further, the load support body and the support structure according to the third aspect of the present invention is the connection structure between the load support body and the support body according to the first aspect or the second aspect. It is a base ring part formed in an annular shape by a steel material, and both longitudinal ends of a plurality of reinforcing members formed in a substantially rod shape elongated in one direction are in contact with the inner peripheral side of the base ring part, respectively. It is preferable.

In addition, the structure for joining the load support body and the support body according to the fourth aspect of the present invention is the structure for joining the load support body and the support body according to the first aspect, in which the annular member is an inner part of the annular member. It is preferable to have a plurality of anchor portions that extend toward the column body side with respect to the peripheral end, and that the tip side is embedded in the concrete forming column.
Moreover, the joining structure of the load support body and the column body according to the fifth aspect of the present invention is the joint of the load support body and the pillar body according to any one of the first to fourth aspects. In the structure, it is preferable that a plurality of the load transmission members are disposed between the connection hook portion and the inner peripheral surfaces of the pair of annular members.

Further, the structure for joining the load support body and the column body according to the sixth aspect of the present invention is the structure for joining the load support body and the column body according to the second aspect, wherein the diaphragm portion is included in the base ring portion. An insertion hole penetrating in the axial direction is formed in a portion of the diaphragm portion corresponding to the connection hook portion, and the load transmitting member is paired with the connection hook portion. It is preferable that the ring member is disposed so as to be inserted between the inner peripheral surface of the annular member and the insertion holes of the pair of diaphragms.
Moreover, the joint structure of the load support body and the column body according to the seventh aspect of the present invention is the joint of the load support body and the column body according to any one of the first aspect to the sixth aspect. In the structure, it is preferable that the load transmitting member is formed in a U-shaped shape, and the pair of annular members are disposed so as to straddle from above.

  According to the eighth aspect of the present invention, the load support and the support structure are bonded to each other in a reinforced concrete load support having a plurality of main reinforcing bars, a concrete column, and an embedded concrete column. And a reinforced concrete column body comprising a column main reinforcing bar group composed of a plurality of reinforcing bars arranged to extend in the axial direction. It is a joining structure for joining a body to the column body, and is provided by projecting a part of the column main reinforcing bar group from the concrete forming column along the axial direction, and is embedded in the concrete molding. A connecting reinforcing bar group, a hook-shaped head portion provided at each of the front ends of a plurality of main reinforcing bars extending from the outer peripheral side of the connecting reinforcing bar group to the center side of the load support, and the connecting reinforcing bar group Outer peripheral side A pair of annular members embedded in the inside of the load support body together with the connecting reinforcing bar group and sandwiching the distal end side of the main reinforcing bar, and the load support body sandwiched between the pair of annular members. And a load transmission member connected to the front end side of the main reinforcing bar and interposed between the head portion and the pair of annular members.

  In the joint structure of the load support body and the support body according to the eighth aspect, the load transmitting member is connected to the distal end side of the main reinforcing bar sandwiched between the pair of annular members, and the head portion and the pair of annular bodies are connected. By being interposed between the members, a load (compressive load or tensile load) from the main reinforcing bar is applied to the pair of concrete layers and the load transmitting member interposed between the head portion and the pair of annular members. In addition to being able to transmit substantially evenly distributed to the annular member, it can be transmitted to the column body via the pair of annular members, the column main reinforcing bar group, and the concrete layer interposed therebetween.

At this time, if the projected area of the load transmission member on the pair of annular members along the transmission direction of the load transmitted from the main reinforcing bar is larger than the projected area of the main reinforcing bar on the pair of annular members, such load transmission is performed. Compared to the case where the main rebar is joined to the annular member without using a member, the load from the main rebar can be evenly distributed and transmitted to a wide area of the pair of annular members via the concrete layer and the load transmitting member. It is possible to effectively prevent the annular member from being locally deformed by the transmission load from the main reinforcing bar.
Therefore, according to the joint structure of the load support body and the column body according to the eighth aspect, it is possible to effectively prevent the annular member from being locally deformed by the transmission load from the main reinforcing bar, and therefore, the deformation of the annular member. Accordingly, it is possible to effectively prevent the transmission efficiency of the load transmitted from the main reinforcing bar to the support body from being lowered.

Further, in the joint structure between the load support body and the support body according to the eighth aspect, the load transmission member is simply connected to the front end side of the main reinforcing bar before or during the placement of the concrete forming the concrete molding. Since the load transmitting member can be loaded on the front end side of the main reinforcing bar, the loading operation of the load transmitting member for transmitting the load between the main reinforcing bar and the pair of annular members can be made extremely simple.
Further, the load support body and the support structure according to the ninth aspect of the present invention are the structure of the load support body and the support body according to the eighth aspect, wherein the annular member is formed in an annular shape by a steel material. It is preferable that a rib-shaped diaphragm portion is joined to at least one of the inner peripheral surface and the outer peripheral surface of the base ring portion.

Further, in the joint structure between the load support body and the column body according to the tenth aspect of the present invention, the annular member is the joint structure between the load support body and the column body according to the eighth aspect or the ninth aspect. It is a base ring part formed in an annular shape by a steel material, and both longitudinal ends of a plurality of reinforcing members formed in a substantially rod shape elongated in one direction are in contact with the inner peripheral side of the base ring part, respectively. It is preferable.
Moreover, the joining structure of the load support body and the column body according to the eleventh aspect of the present invention is the junction of the load support body and the column body according to any one of the eighth aspect to the tenth aspect. In the structure, it is preferable that a cross-sectional shape of the load transmission member is formed in a U-shape or a C-shape, and the load transmission member is inserted into an outer peripheral side of the main rebar of the load support and connected to the main rebar.

  According to a twelfth aspect of the present invention, a structure for joining a load support body and a support body is embedded in a reinforced concrete load support body including a plurality of main reinforcing bars, a concrete forming column, and the concrete forming column. And a reinforced concrete column body comprising a column main reinforcing bar group composed of a plurality of reinforcing bars arranged to extend in the axial direction. It is a joining structure for joining a body to the pillar body, and a part of the column main reinforcing bar group is provided to protrude from the concrete forming pillar along the axial direction, and is embedded in the load support body. A connecting reinforcing bar group, an annular member that is disposed on the outer peripheral side of the connecting reinforcing bar group, and embedded in the load support body, and from the outer peripheral side of the connecting reinforcing bar group of the load support body toward the center side Double extension A hook-like connecting hook portion provided at the tip of each main reinforcing bar, and at least a part thereof being inserted into the inner peripheral side of the annular member, and an inner side of the connecting hook portion. And a load transmission member disposed so as to be inserted through the circumferential side.

  In the joint structure of the load support body and the column body according to the twelfth aspect, the load transmitting member is located inside the connecting hook portion provided at the distal end portion of the main reinforcing bar sandwiched between the pair of annular members. And a concrete layer interposed between the connecting hook portion and the annular member, with a load (compressive load or tensile load) from the main rebar being arranged so as to be inserted through the inner peripheral side of the pair of annular members; While being able to transmit to an annular member via a load transmission member, it can transmit to a support | pillar body via an annular member, a connection reinforcing bar group, and the concrete layer interposed among these.

At this time, if the projected area of the load transmission member on the annular member along the transmission direction of the load transmitted from the main reinforcing bar is larger than the projected area of the main reinforcing bar on the annular member, such a load transmitting member is not used. In comparison with the case where the main reinforcement is joined to the annular member via the connecting hook portion, the load from the main reinforcement can be evenly distributed and transmitted to the wide area of the annular member via the concrete layer and the load transmission member. It is possible to effectively prevent the annular member from being locally deformed by the transmission load from the main reinforcing bar.
Therefore, according to the joint structure of the load support body and the column body according to the twelfth aspect, it is possible to effectively prevent the annular member from being locally deformed due to the transmission load from the main reinforcing bar, and therefore the deformation of the annular member. Accordingly, it is possible to effectively prevent the transmission efficiency of the load transmitted from the main reinforcing bar to the support body from being lowered.

  Further, in the joint structure of the load support body and the support body according to the twelfth aspect, the connection is formed in which the load transmission member is formed at the tip of the main reinforcing bar before or during the placement of the concrete forming the concrete molding. The load transmitting member can be loaded into the connecting hook portion of the main rebar simply by placing it inside the hook portion so as to pass through the inner peripheral side of the annular member, so between the main rebar and the pair of annular members The loading operation of the load transmitting member for transmitting the load can be made extremely simple.

The load support and support structure according to the thirteenth aspect of the present invention is the structure of the load support and support structure according to the twelfth aspect, wherein the annular member is formed annularly from a steel material. It is preferable that at least one of the inner peripheral surface and the outer peripheral surface of the base ring portion is bonded with a rib-shaped diaphragm portion.
In addition, the structure for joining the load support body and the support body according to the fourteenth aspect of the present invention is the joint structure of the load support body and the support body according to the twelfth aspect or the thirteenth aspect, and the annular member is It is a base ring part formed in an annular shape by a steel material, and both longitudinal ends of a plurality of reinforcing members formed in a substantially rod shape elongated in one direction are in contact with the inner peripheral side of the base ring part, respectively. It is preferable.

  According to a fifteenth aspect of the present invention, there is provided a joint structure between the load support and the column body, in the joint structure between the load support body and the pillar body according to the thirteenth aspect, wherein the diaphragm portion is included in the base ring portion. An insertion hole that penetrates in the axial direction is formed in a portion corresponding to the connection hook portion in the diaphragm portion, and the load transmitting member is disposed inside the connection hook portion. And it is preferable to arrange | position so that it may each penetrate the said insertion hole in a pair of said diaphragm part while inserting the inner peripheral side of a pair of said annular member.

Moreover, the joining structure of the load support body and the column body according to the sixteenth aspect of the present invention is the junction of the load support body and the column body according to any one of the twelfth aspect to the fifteenth aspect. In the structure, it is preferable that the load transmission member is formed in a U-shaped shape and is arranged so as to straddle the annular member from above.
Moreover, the joint structure of the load support body and the support body according to the seventeenth aspect of the present invention is the joint structure of the load support body and the support body of the twelfth aspect, wherein the annular member is made of the concrete molded product. The load transmission member is sandwiched between a pair of main rebars of the pair of load supports that are respectively arranged at different positions along the thickness direction in the interior, and the connection in the main rebar of one of the pair of main rebars It is preferable that the inner side of the hook member, the inner peripheral side of the annular member, and the inner side of the connecting hook portion of the other main reinforcing bar among the pair of main reinforcing bars are respectively inserted.

  As described above, according to the joint structure of the load support body and the support body according to the present invention, the load transmitted from the main reinforcing bar via the load transmission member is distributed and transmitted to a wide region of the pair of annular members. Thus, the deformation of the annular member can be effectively prevented, and the loading operation of the load transmitting member can be simplified.

It is sectional drawing which shows the structure of the ramen viaduct to which the joining structure which concerns on the 1st Embodiment of this invention was applied. It is the top view and sectional drawing of the junction structure concerning a 1st embodiment of the present invention. It is the top view and side sectional drawing of a joint ring in the junction structure concerning a 1st embodiment of the present invention. It is the top view and sectional drawing which show the structure of the joining structure of the crossing main reinforcement and the steel pipe pillar in the ramen viaduct shown by FIG. It is the top view and sectional drawing which show the internal structure of the side edge part vicinity along the bridge width direction in the ramen viaduct shown by FIG. It is a bending moment figure which shows the moment distribution which acts on a ramen viaduct when the horizontal load along a bridge width direction acts on the elevated beam which concerns on the 1st Embodiment of this invention. It is the top view and side view of a joining structure for demonstrating the construction method of the ramen viaduct to which the joining structure which concerns on the 1st Embodiment of this invention is applied. It is the top view and side view of a joining structure for demonstrating the construction method of the ramen viaduct to which the joining structure which concerns on the 1st Embodiment of this invention is applied. It is the top view and side view of a joining structure for demonstrating the construction method of the ramen viaduct to which the joining structure which concerns on the 1st Embodiment of this invention is applied. It is the top view and side view of a steel pipe pillar and joining structure vicinity for demonstrating the construction method of the rigid frame viaduct to which the joining structure which concerns on the 1st Embodiment of this invention is applied. It is the top view and sectional drawing which show the structure at the time of using the modification of the load transmission rod which concerns on the 1st Embodiment of this invention for joining structure. It is the top view and sectional view showing the composition of the 1st modification of the joint ring used for the joining structure concerning a 1st embodiment of the present invention. It is the top view and sectional view showing the composition of the 2nd modification of the joint ring used for the joining structure concerning a 1st embodiment of the present invention. It is the top view and sectional view showing the composition of the 3rd modification of the joint ring used for the joining structure concerning a 1st embodiment of the present invention. It is the top view and sectional view showing the composition of the 4th modification of the joint ring used for the junction structure concerning the embodiment of the present invention. It is the top view and sectional view showing the composition of the 5th modification of the joint ring used for the junction structure concerning a 1st embodiment of the present invention. It is the top view and sectional view showing the composition of the 6th modification of the joint ring used for the joining structure concerning a 1st embodiment of the present invention. It is the top view and sectional view showing the composition of the 7th modification of the joint ring used for the junction structure concerning a 1st embodiment of the present invention. It is the top view and sectional view showing the composition of the 8th modification of the joint ring used for the junction structure concerning a 1st embodiment of the present invention. (A) And (B) is the top view, sectional drawing, and perspective view of the joining structure concerning the 2nd Embodiment of this invention, (C) is a disassembled perspective view of a cross main reinforcement and a load transmission spacer. It is the perspective view and sectional drawing of the joining structure which concern on the 3rd Embodiment of this invention. It is a perspective view of the junction structure concerning a 4th embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, a ramen viaduct according to an embodiment of the present invention and a joint structure between a load support body and a support body applied to the ramen viaduct will be described with reference to the drawings.
[First embodiment]
(Structure of ramen viaduct and joint structure)
DESCRIPTION OF EMBODIMENTS Hereinafter, a ramen viaduct according to a first embodiment of the present invention and a joint structure between a load support body and a support body applied to the ramen viaduct will be described with reference to the drawings.
FIG. 1 shows a structure of a ramen viaduct to which the joining structure according to the first embodiment of the present invention is applied. In FIG. 1, arrow WB indicates the bridge width direction of the viaduct, and arrow HB indicates the height direction of the viaduct.

The ramen viaduct 10 includes an elevated beam 12 that is a load support that is supported above the ground surface G, an underground beam 14 that is a load support that is embedded below (under the ground) the ground surface G, and Each includes a plurality of RC (Reinfoced-Concrete) pillars 16 which are pillars connecting the elevated beam 12 and the underground beam 14.
The elevated beam 12 includes a concrete molding 18 formed in a thick plate shape or a prism shape, a plurality of lower main reinforcing bars 21 embedded in the lower surface side of the concrete molding 18, and the inside of the concrete molding 18. Are provided with a plurality of upper main reinforcing bars 22 embedded on the upper surface side. The concrete molding 18 is formed in a substantially rectangular or substantially rectangular shape along the bridge axis direction (in the direction of arrow SB in FIG. 2A) in plan view, and the cross section along the direction perpendicular to the bridge axis is the width direction. Are formed in an elongated rectangular shape.

The lower main reinforcing bar 21 and the upper main reinforcing bar 22 in the elevated beam 12 extend along the bridge width direction (see FIG. 1) and extend along the bridge axis direction perpendicular to the bridge (see FIG. 1). These are combined in a two-dimensional or three-dimensional (two-dimensional in the present embodiment) lattice pattern to constitute the lower main reinforcing bar 21 and the upper main reinforcing bar 22, respectively.
The underground beam 14 also includes a concrete molding 18 formed in a thick plate shape, and a plurality of lower main reinforcing bars 21 and upper main reinforcing bars 22 embedded in the concrete molding 18. The lower main reinforcing bar 21 and the upper main reinforcing bar 22 in the underground beam 14 also extend along the bridge width direction and the bridge axis direction in the same manner as the lower main reinforcing bar 21 and the upper main reinforcing bar 22 in the elevated beam 12. Those are configured by being combined in a two-dimensional or three-dimensional (two-dimensional in the present embodiment) lattice pattern.

  The RC column 16 includes a concrete column 26 formed in a columnar shape or a prism shape, and a plurality of column main reinforcing bars 24 embedded in the concrete column 26 so as to extend in the axial direction. A column main reinforcing bar group 25 is provided. The column main rebar 24 is formed of a rebar material formed in the shape of an elongated round bar as a whole, and uneven projections such as ribs and nodes are formed on the outer peripheral surface thereof. Note that the number and arrangement of the column main reinforcing bars 24 shown in the drawings referred to in the following description are merely examples, and such column main reinforcing bars 24 have bending rigidity and the like required for the RC column 16. Accordingly, the number of burials in the concrete forming column 26 is appropriately increased and decreased, and the arrangement is also changed.

The center axis CP of the RC pillar 16 substantially coincides with the height direction of the ramen viaduct 10. As shown in FIG. 1, the concrete forming column 26 in the RC column 16 has its upper end surface and lower end surface joined to the lower end surface of the elevated beam 12 (concrete molding 18) and the upper end surface of the underground beam 14, respectively. Yes. However, the concrete molded column 26 is substantially integrated with the concrete molded product 18 at the joint surface with the concrete molded product 18, and it can be considered that there is no physical boundary (joining interface). .

The plurality of column main reinforcing bars 24 (column main reinforcing bar group 25) in the RC column 16 are longer than the entire length of the concrete forming column 26, and the upper end side and the lower end side thereof are the upper end surface and the lower end surface of the concrete forming column 26. Project from each. As a result, each column main reinforcing bar 24 is integrally formed with a connecting portion 57 embedded in the elevated beam 12 and the underground beam 14 on the upper end side and the lower end side, respectively. The upper connecting portion 57 protrudes from the lower end surface of the elevated beam 12 to directly below the upper main reinforcing bar 22. Moreover, the lower end of the lower connecting portion 57 reaches the lower end surface of the underground beam 14.
In the following description, a group of a plurality of connecting portions 57 respectively formed on the upper side and the lower side of the plurality of column main reinforcing bars 24 is referred to as a “connected reinforcing bar group 58”.

  The lower main reinforcing bar 21 and the upper main reinforcing bar 22 in the underground beam 14 extend from the outer peripheral side of the connecting reinforcing bar group 58 toward the virtual boundary BL (see FIG. 2) extending the outer peripheral surface of the RC column 16. The extension line intersects the virtual boundary BL, and the extension line does not intersect the virtual boundary BL. FIG. 1 shows only the lower main reinforcing bar 21 and the upper main reinforcing bar 22 in the underground beam 14 where the extension line intersects the virtual boundary BL.

  The lower main reinforcing bar 21 in the elevated beam 12 also extends from the outer peripheral side of the connecting reinforcing bar group 58 toward the virtual boundary BL side, the extension line intersects the virtual boundary BL, and the extension line is the virtual boundary. Some do not intersect with BL. FIG. 1 shows only the lower main reinforcing bar 21 in the elevated beam 12 where the extension line intersects the virtual boundary BL. Here, the virtual boundary BL is regarded as a boundary between the region reinforced by the connected reinforcing bar group 58 (column main reinforcing bar group 25) and the region reinforced by the lower main reinforcing bar 21 or the upper main reinforcing bar 22 in the concrete molding 18. Can be tricked.

As described above, the lower main reinforcing bar 21 and the upper main reinforcing bar 22 (hereinafter collectively referred to as “intersecting main reinforcing bar 20”) intersecting the virtual boundary BL are shown in FIG. As described above, a connecting hook portion 28 that is bent in a U-shape and is turned back to the outer peripheral side of the connecting reinforcing bar group 58 is formed at the tip portion.
Among the intersecting main reinforcing bars 20, a plurality of (two in the present embodiment) intersecting main reinforcing bars 20 on one side in the bridge width direction across the connecting reinforcing bar group 58 have the tips of the respective connecting hook portions 28. A plurality of (two in this embodiment) intersecting main reinforcing bars 20 that are located at the same position along the bridge width direction and that are on the other side in the bridge width direction across the connecting reinforcing bar group 58 are also connected hook portions. The tips of 28 are in the same position along the bridge width direction.

  Similarly, among the intersecting main reinforcing bars 20, a plurality of (two in the present embodiment) intersecting main reinforcing bars 20 on one side in the bridge axis direction across the connecting reinforcing bar group 58 are connected to the distal end of the connecting hook portion 28. Are connected to each other along the bridge axis direction, and a plurality of (in this embodiment, two) cross main reinforcing bars 20 on the other side in the bridge axis direction across the connecting reinforcing bar group 58 are also connected to the connecting hook portion 28. The tips of each other are at the same position along the bridge axis direction. These intersecting main reinforcing bars 20 have the tips of the connecting hook portions 28 spaced apart from the virtual boundary BL toward the outer peripheral side, and the distance from the central axis CP of the RC pillar 16 to the tips of the connecting hook portions 28 is substantially constant. It is a thing.

  In the rigid frame viaduct 10 according to the present embodiment, as shown in FIG. 1, the distal end side of the intersecting main reinforcing bar 20 is joined to the upper connecting reinforcing bar group 58 by the joining structure 30. Therefore, the intersecting main reinforcing bars 20 are joined to the entire RC column 16 including the lower connecting reinforcing bar group 58 via the upper connecting reinforcing bar group 58. Here, the term “joining” means that when an external force or an internal stress acts on the ramen viaduct 10 and a load is transmitted to an arbitrary intersecting main reinforcing bar 20, the load transmitted to the intersecting main reinforcing bar 20 is transmitted from the intersecting main reinforcing bar 20. This means that the cross main reinforcing bars 20 and the RC pillars 16 are mechanically connected so that they can be transmitted to the RC pillars 16 and can be transmitted to the other crossing main reinforcing bars 20 via the RC pillars 16. And

  As shown in FIG. 1, the joint structure 30 includes a pair of joint rings 32 and 34 disposed on the upper side and the lower side of the intersecting main reinforcing bar 20 along the height direction. The joint ring 32 and the joint ring 34 have basically the same shape, and are formed in a substantially square ring shape in plan view as shown in FIGS. 3 (A) and 3 (B). The joint rings 32 and 34 are provided with a base ring portion 36 in which a steel rod is formed in an annular shape on the outer peripheral side thereof, and joined to the inner peripheral surface of the base ring portion 36 over the entire circumference by welding or the like. A rib-shaped diaphragm portion 38 is provided. The base ring portion 36 is formed with four side portions 36 </ b> A to 36 </ b> D that extend linearly along the bridge axis direction and the bridge width direction, respectively.

Here, the base ring portion 36 is formed of a steel rod having a rectangular cross section because the diaphragm portion 38 can be easily joined to the inner peripheral surface. good. Further, the base ring portion 36 may be formed of a steel pipe having a hollow inside, and the cross-sectional shape in that case may be an arbitrary shape including a rectangle.
The diaphragm portion 38 is formed from a steel plate having a constant thickness, and an outer peripheral end portion thereof is joined to a central portion in the thickness direction on the inner peripheral surface of the base ring portion 36. As shown in FIG. 3A, the diaphragm portion 38 is provided with a circular opening 40 on the center side, and the inner diameter of the circular opening 40 is larger than the outer diameter of the virtual boundary BL (RC column 16). Slightly larger. Here, the center of the circular opening 40 coincides with a geometric center point (center of gravity) in a cross section (horizontal cross section) along the bridge width direction and the bridge axis direction of the base ring portion 36.

  As shown in FIG. 1, the pair of joint rings 32 and 34 are fitted on the outer peripheral side of the connecting reinforcing bar group 58 and embedded in the concrete molding 18 together with the connecting reinforcing bar group 58. Specifically, two pairs of joint rings 32 and 34 are arranged inside the underground beam 14 with respect to one connecting reinforcing bar group 58, and one connecting reinforcing bar group 58 is arranged inside the elevated beam 12. On the other hand, only one pair of the joint rings 32 and 34 is arranged.

  Of the two sets of joint rings 32 and 34 arranged in the underground beam 14, one set of joint rings 32 and 34 is arranged at a position corresponding to the lower main reinforcing bar 21 along the height direction, and the rest. The pair of joint rings 32 and 34 are arranged at positions corresponding to the upper main reinforcing bar 22 along the height direction. At this time, as shown in FIG. 4B, the pair of joint rings 32 and 34 arranged on the lower surface side in the underground beam 14 has the lower main reinforcing bar 21 (intersection) between the base ring portions 36. The front end side of the main reinforcing bar 20) is clamped. The pair of joint rings 32 and 34 arranged on the upper surface side in the underground beam 14 sandwich the tip side of the upper main reinforcing bar 22 (crossed main reinforcing bar 20) between the base ring portions 36.

  On the other hand, the pair of joint rings 32 and 34 arranged in the elevated beam 12 is arranged at a position corresponding to the lower main reinforcing bar 21 along the height direction, and the lower main reinforcing bar is between the base ring portions 36. 21 (crossing main reinforcing bar 20) is pinched. The pair of joint rings 32, 34 are fitted and inserted on the outer peripheral side of the connecting reinforcing bar group 58, and are arranged so as to sandwich the intersecting main reinforcing bar 20 between the base ring parts 36. Loading of the reinforcing bar 20 is completed.

  In the pair of joint rings 32 and 34 embedded in the underground beam 14 and the elevated beam 12, a gap having a width corresponding to the outer diameter of the intersecting main reinforcing bar 20 is formed between the pair of base ring portions 36. The joint rings 32, 34 are not inclined with respect to the height direction (the axial direction of the RC column 16) by sandwiching the intersecting main reinforcing bars 20 directly or via a thin concrete layer between the base ring portions 36. Supported by At this time, the joint rings 32 and 34 are positioned so that the center of the circular opening 40 substantially coincides with the central axis CP of the RC column 16. Thereby, a gap having a substantially constant width is formed over the entire circumference between the inner peripheral end of the diaphragm portion 38 and the virtual boundary BL.

  As shown in FIG. 4, the pair of joint rings 32 and 34 according to the present embodiment sandwich two intersecting main reinforcing bars 20 between the side portions 36 </ b> A to 36 </ b> D. However, the number of intersecting main reinforcing bars 20 sandwiched between the side portions 36A to 36D is not limited to two, and this number is the diameter of the RC pillar 16 and the lower main embedded in the concrete molding 18. Increase or decrease depending on the density (pitch) of the reinforcing bars 21 or the upper main reinforcing bars 22.

  5A and 5B show the internal structure in the vicinity of the side end along the bridge width direction in the ramen viaduct 10. As shown in FIG. 5A, in the vicinity of the end portion along the bridge width direction in the ramen viaduct 10, a bent portion 42 that is curved downward is formed in the upper main reinforcing bar 22, and the bent portion 42 is formed. On the other hand, the tip side portion extends to the lower side of the lower main reinforcing bar 21 along the side end surface of the concrete molding 18. Thereby, the restraining force with respect to the upper main reinforcement 22 in the concrete molding 18 increases, and the upper main reinforcement 22 is prevented from sliding along the longitudinal direction due to an external load or the like.

  As shown in FIG. 4, the joint structure 30 includes a plurality of load transmission rods 44 that are respectively loaded in the cross main reinforcing bars 20. Here, the load transmission rod 44 is made of a straight rod-like steel material, and is formed by, for example, trimming a reinforcing bar material having protrusions such as ribs and nodes on the surface to a predetermined length. The length of the load transmission rod 44 is longer than the distance between the lower end surface of the joint ring 32 sandwiching the intersecting main reinforcing bars 20 and the upper end surface of the joint ring 34.

  As shown in FIG. 2A, in the joint structure 30, two sets of load transmission rods 44 are loaded on one intersecting main reinforcing bar 20. The pair of load transmission rods 44 is located on the inner peripheral side of the pair of base ring portions 36 inside the connection hook portion 28 of the cross main reinforcing bar 20 sandwiched between the pair of joint rings 32 and 34. Are arranged as follows. At this time, the load transmission rod 44 is in an upright state such that the longitudinal direction thereof substantially coincides with the axial direction of the RC column 16. Further, one load transmission rod 44 in one set is located on one end side in the connecting hook portion 28 along the width direction (arrow WR direction) of the crossed main reinforcing bar 20, and the remaining one load transmission rod 44 44 is located on the other end side in the connecting hook portion 28 along the width direction of the intersecting main reinforcing bar 20. Further, the two load transmission rods 44 are located at substantially the same position in the connecting hook portion 28 along the reinforcing bar axis direction (the direction of the arrow LR in FIG. 2A) that coincides with the longitudinal direction of the intersecting main reinforcing bars 20.

  Insertion holes 46 are formed in the pair of diaphragm portions 38 so as to face the inner sides of the respective connecting hook portions 28. Two insertion holes 46 (one set) are provided for each connection hook portion 28, and the positions of the two insertion holes 46 in the width direction WR and the longitudinal direction LR are connected to each other. The position substantially coincides with the position where the set of two load transmission rods 44 are disposed in the hook portion 28.

  The load transmission rod 44 loaded in the crossing main reinforcing bar 20 has an insertion hole 46 drilled in the upper diaphragm portion 38, an inner side of the connecting hook portion 28, and an insertion hole 46 drilled in the lower diaphragm portion 38. Are respectively inserted along the axial direction of the RC column 16. At this time, the load transmitting rod 44 is inserted through the through holes 46 respectively formed in the pair of diaphragm portions 38, whereby the load transmitting rod 44 can be reliably positioned at a predetermined loading position with respect to the connecting hook portion 28, and the load Inclination of the transmission rod 44 with respect to the axial direction can also be restricted.

In the joint structure 30, the pair of joint rings 32, 34, the cross main reinforcing bar 20 and the load transmission rod 44 sandwiched between the pair of joint rings 32, 34 are arranged on the outer peripheral side of the connecting reinforcing bar group 58, respectively. It is embedded in the concrete molding 18 together with the group 58. As a result, the intersecting main reinforcing bars 20 are joined to the connecting reinforcing bar group 58 by the joining structure 30. Therefore, when a load is transmitted from the outside to the arbitrary intersecting main reinforcing bars 20, or internal stress acts, the intersecting main reinforcing bars 20 are connected. A part of the load (compressive load or tensile load) transmitted to is transmitted to the connecting reinforcing bar group 58 via the load transmitting rod 44, the pair of joint rings 32, 34, and the concrete layer 48 interposed therebetween, It is transmitted to the RC pillar 16 through the connecting reinforcing bar group 58.
At this time, the sum of the projected areas of the two load transmission rods 44 along the transmission direction of the load transmitted from the intersecting main reinforcing bar 20 with respect to the pair of joint rings 32, 34 is equal to the pair of the intersecting main reinforcing bars 20. The projected area for the joint rings 32 and 34 is larger.

  In addition, when the cross main reinforcing bar 20 that has transmitted the load to the connecting reinforcing bar group 58 is disposed on the elevated beam 12, the load transmitted from the crossing main reinforcing bar 20 to the connecting reinforcing bar group 58 is via the RC column 16. It is transmitted to a plurality of intersecting main reinforcing bars 20 around the connecting reinforcing bar group 58 in the underground beam 14. On the contrary, when the cross main reinforcing bar 20 that has transmitted the load to the connecting reinforcing bar group 58 is disposed on the underground beam 14, the load transmitted from the crossing main reinforcing bar 20 to the connecting reinforcing bar group 58 is RC. It is transmitted to the plurality of intersecting main reinforcing bars 20 around the connecting reinforcing bar group 58 in the elevated beam 12 via the column 16. Part of the load transmitted from the cross main reinforcing bar 20 to the pair of joint rings 32 and 34 is also transmitted to the plurality of cross main reinforcing bars 20 located on the opposite side via the joint rings 32 and 34.

Next, referring to FIGS. 5 and 6, when a horizontal load (in this case, a load along the bridge width direction) F acts on the elevated beam 12, an internal load and a bending moment generated in the ramen viaduct 10. Will be described.
FIG. 6 shows a moment distribution acting on the rigid frame viaduct 10 when a horizontal load F along the bridge width direction acts on the elevated beam 12. When a moment as shown in FIG. 6 acts on the ramen viaduct 10, the elevated beam 12 undergoes bending deformation along the bridge width direction. Along with this bending deformation, a tensile force along the bridge width direction is generated in the lower beam via the neutral plane NF in the elevated beam 12, and in the upper region via the neutral plane NF. A compressive force is generated along the bridge width direction.

  As a result, as shown in FIG. 5, a tensile force R <b> 1 along the reinforcing bar axial direction (bridge width direction) is transmitted to the lower main reinforcing bar 21 via the concrete molding 18, and the upper main reinforcing bar 22 is transmitted to the upper main reinforcing bar 22. The compressive force R2 along the rebar axial direction (bridge width direction) is transmitted through the concrete molding 18. At this time, the compression force R2 of the upper main reinforcing bar 22 is supported by the compression resistance of the concrete molding 18 and is transmitted to the connecting reinforcing bar group 58 as the concrete support pressure CU via the concrete molding 18. The concrete support pressure CU gradually decreases from the upper main reinforcing bar 22 toward the neutral plane NF along the axial direction of the RC column 16.

  On the other hand, the tensile force R1 of the lower main reinforcing bar 21 is transmitted through the load transmission rod 44 as a support pressure C1 being distributed substantially evenly to the pair of upper and lower joint rings 32, 34. This support pressure C1 is converted to a support pressure C2 by a pair of joint rings 32, 34 on the opposite side of the lower main reinforcing bar 21, and is transmitted to the connected reinforcing bar group 58 as a concrete support pressure CL via the concrete layer 48. The concrete bearing pressure CL gradually increases in magnitude from the neutral plane NF toward the lower end surface of the elevated beam 12.

(Ramen viaduct construction method)
Next, referring to FIG. 7 to FIG. 10, a method for constructing the ramen viaduct 10 to which the joining structure 30 according to the present embodiment is applied, and joining of the intersecting main reinforcing bar 20 and the connecting reinforcing bar group 58 (RC column 16). A method will be described.
Here, the case where the elevated beam 12 is continuously constructed after the underground beam 14 in the ramen viaduct 10 is completed will be described. In this case, the plurality of column main reinforcing bars 24 (column main reinforcing bar group 25) in the RC column 16 are in a state where the lower connecting reinforcing bar group 58 is embedded in the underground beam 14, and is shown in FIG. Thus, the rebar axial direction is substantially parallel to the central axis CP of the RC column 16. Moreover, the column main reinforcement group 25 is arrange | positioned in the cross section of the part used as the concrete shaping | molding pillar 26, and is arrange | positioned (reinforcement) in the dense state along the outer peripheral part of this cross section.

  When joining the intersecting main reinforcing bars 20 to the connecting reinforcing bar group 58 with the connecting structure 30 according to the present embodiment, first, as shown in FIG. A lower joint ring 34 is inserted into a portion corresponding to the intersecting main reinforcing bar 20 (the lower main reinforcing bar 21 in FIG. 7B) along the height direction of the viaduct 10, and the center of the joint ring 34 is the RC column. Position so as to coincide with 16 central axes CP. Thereafter, the joint ring 34 is temporarily fixed to the connecting reinforcing bar group 58. At this time. The joint ring 34 is fixed to the connection reinforcing bar group 58 by being connected by a working scaffold assembled around the connection reinforcing bar group 58 via a bracket or the like, for example.

  Next, as shown in FIG. 8, a plurality of reinforcing bars are arranged along the bridge width direction and the bridge axis direction along a horizontal plane having a predetermined height from the ground surface G. The main rebar 21 is assembled in a two-dimensional grid. Among these lower main reinforcing bars 21, the cross main reinforcing bars 20 extending from the outer peripheral side of the connecting reinforcing bar group 58 to the vicinity of the virtual boundary BL are U-shaped at the tip as shown in FIG. 8B. In which the connecting hook portion 28 is formed. The front ends of these intersecting main reinforcing bars 20 are supported on the joint ring 34 so as not to bend downward by being placed on the joint ring 34.

  After completion of the assembly of the lower main reinforcing bar 21, as shown in FIG. 9, the upper joint ring 32 is fitted on the outer peripheral side of the connecting reinforcing bar group 58, and the joint ring 32 is placed on the intersecting main reinforcing bar 20. At the same time, positioning is performed along the bridge width direction and the bridge axis direction so that the center of the joint ring 32 coincides with the center axis CP. In this state, as shown in FIG. 10, the load transmission rod 44 is inserted from above into the insertion hole 46 of the joint ring 34, the inside of the connecting hook portion 28, and the insertion hole 46 of the joint ring 32. 44 is loaded into the connecting hook portion 28 of the crossing main reinforcing bar 20.

The load transmission rod 44 is temporarily fixed to the diaphragm portion 38 of the joint ring 32 with, for example, a clip for temporary fixing so as not to drop off from the joint rings 32 and 34 and the connecting hook portion 28. Note that a flange-like member is fixed to the outer peripheral surface of the load transmission rod 44 in advance by welding, rolling, or the like, and this flange-like member is brought into contact with the diaphragm portion 38 of the joint ring 32 so that the load transmission rod 44 is detached. You may make it prevent.
After loading the load transmission rods 44 to all the intersecting main reinforcing bars 20, as shown in FIG. 10, a plurality of reinforcing bars are arranged in the bridge width direction and the bridge axis along a horizontal plane having a predetermined height from the ground surface G. The bars are arranged along the direction, and the upper main reinforcing bars 22 are assembled in a two-dimensional lattice shape by these reinforcing bars.

  Finally, a cylindrical concrete frame (not shown) is installed so as to surround the underground beam 14 and the elevated beam 12 in the column main reinforcing bar group 25, and the connecting reinforcing bar group 58, the lower main reinforcing bar 21, and the upper main reinforcing bar 21 A casing-like concrete frame (not shown) having an open top surface is installed so as to surround the main reinforcing bar 22. Here, the upper end (opening end) of the concrete frame for forming the concrete forming column 26 opens to the bottom surface portion of the concrete frame for forming the concrete molding 18 of the elevated beam 12.

  Therefore, after pouring the uncured concrete material into the concrete frames for molding the concrete forming columns 26, the uncured concrete material is poured into the concrete frames for molding the concrete molding 18, and these concrete frames To harden the concrete. As a result, the concrete molding column 26 and the concrete molding 18 are respectively molded from concrete, and the construction of the RC column 16 and the elevated beam 12 is completed.

  Note that the concrete molded column 26 may be formed integrally with the concrete molded product 18 of the underground beam 14 at the lower end side and then formed integrally with the concrete molded product 18 of the elevated beam 12. In addition, the intermediate portion excluding a part on the lower end side and a part on the upper end side is preliminarily formed with concrete (precast), and a part on the lower end side is formed integrally with the concrete molding 18 of the underground beam 14. After that, a part of the upper end side may be integrally formed with the concrete molding 18 of the elevated beam 12.

(Operation of bonding structure)
Next, the operation of the joint structure 30 according to this embodiment will be described. In the joint structure 30 according to the present embodiment, the rod-shaped load transmission rod 44 is inside the connection hook portion 28 of the crossed main reinforcing bar 20 sandwiched between the pair of joint rings 32, 34, and is a pair of base ring portions 36. The load (compressive load or tensile load) from the crossed main reinforcing bars 20 is substantially evenly distributed to the pair of joint rings 32 via the concrete layer 48 and the load transmission rod 44. And can be transmitted to the connected reinforcing bar group 58 (RC column 16) via the pair of joint rings 32 and 34.

  At this time, the sum of the projected areas of the load transmission rod 44 along the transmission direction (rebar axis direction) of the load transmitted from the cross main reinforcing bar 20 with respect to the pair of joint rings 32 and 34 is equal to one cross main reinforcing bar 20. Since it is larger than the projected area with respect to the pair of joint rings 32 and 34, the cross main reinforcing bar 20 can be compared with the case where the cross main reinforcing bar 20 is directly joined to the joint ring without using such a load transmission rod 44. Since the load can be evenly distributed and transmitted to a wide area of the pair of joint rings 32 and 34 via the concrete layer 48 and the load transmission rod 44, the pair of joint rings 32 and 34 are formed by the transmission load from the cross main reinforcing bar 20. It is possible to effectively prevent local deformation.

Therefore, according to the joint structure 30 according to the present embodiment, it is possible to effectively prevent the pair of joint rings 32 and 34 from being locally deformed by the transmission load from the intersecting main reinforcing bars 20, and thus the joint rings 32 and 34. It is also possible to effectively prevent the transmission efficiency of the load transmitted from the intersecting main reinforcing bar 20 to the connecting reinforcing bar group 58 (RC column 16) from being reduced.
Further, in the joint structure 30, the load transmission rod 44 is disposed inside the connecting hook portion 28 of the crossed main reinforcing bar 20 and through the inner peripheral side of the pair of base ring portions 36 before placing concrete. As a result, the load transmission rod 44 can be loaded into the connecting hook portion 28 of the crossing main reinforcing bar 20, so that the load transmission rod 44 for transmitting the load between the crossing main reinforcing bar 20 and the pair of joint rings 32 and 34 can be loaded. It can be very simple.

  Further, in the joint structure 30 according to the present embodiment, the joint rings 32 and 34 are configured such that a rib-like diaphragm portion 38 is joined to the inner peripheral surface of the base ring portion 36 formed in an annular shape by a steel material over the entire circumference. As a result, the bending stiffness of the joint rings 32 and 34 with respect to the load transmitted from the intersecting main reinforcing bar 20 can be greatly increased compared to the case where only the base ring portion 36 is configured. It becomes possible to more effectively prevent the pair of joint rings 32 and 34 from being locally deformed by the transmission load from the reinforcing bar 20.

(Modification of load transmission rod)
Next, a modified example of the load transmission rod 44 used in the joint structure 30 according to the first embodiment of the present invention will be described. FIG. 11 shows a configuration when a modification of the load transmission rod is used in the joint structure 30 according to the present embodiment. As shown in FIG. 11B, the load transmission rod 50 is formed by bending a steel bar such as a reinforcing bar material into a U shape. The load transmission rod 50 has a straight straight bar portion 52 formed on one end side along the longitudinal direction thereof, and a straight straight rod portion 54 formed on the other end side. A curved portion 56 curved in an arc shape is formed between 52 and 54.

  In the joint structure 30, the load transmission rod 50 is disposed so as to straddle the base ring portion 36 in the pair of joint rings 32 and 34 from above. At this time, the straight rod portion 52 on one end side is disposed so as to pass through the insertion hole 46 of the joint ring 32, the inside of the connecting hook portion 28, and the insertion hole 46 of the joint ring 34, and the straight rod portion on the other end side. 54 is arranged on the outer peripheral side of the pair of joint rings 32, 34. Further, when the straight rod portion 52 on one end side is inserted through the insertion holes 46 of the pair of upper and lower joint rings 34, the longitudinal direction of the straight rod portions 52 and 54 is substantially coincident with the axial direction of the RC column 16. , And supported by a pair of joint rings 32, 34.

  In the joint structure 30 using the load transmission rod 50 described above, the straight rod portion 52 of the load transmission rod 50 is inserted into the insertion hole 46 of the joint ring 32, the inside of the connecting hook portion 28, and the insertion hole 46 of the joint ring 34. Since the load transmission rod 50 is supported from below by the pair of joint rings 32 and 34 just by inserting the straight rod portion 54 into the outer peripheral side of the pair of joint rings 32 and 34, the temporary rod portion 54 is temporarily inserted. Even if a clip for stopping is used or the hook-shaped member is not fixed to the load transmission rod 50, the load transmission rod 50 can be reliably prevented from falling off from the cross main reinforcing bar 20 and the pair of joint rings 32 and 34. Therefore, the loading operation | work with respect to the cross main reinforcement 20 of the load transmission rod 50 can be simplified.

(Modification of joint ring)
Next, a modification of the joint ring used in the joint structure 30 according to the first embodiment of the present invention will be described. In the following description, the same parts as those of the joint rings 32 and 34 are denoted by the same reference numerals and description thereof is omitted.
FIG. 12 shows a first modification of the joint ring in the joint structure 30 according to the present embodiment. The joint ring 60 is formed in an annular shape in plan view, and a base ring part 62 formed of a steel material having a substantially rectangular cross section and a plurality of pieces arranged on the inner peripheral side of the base ring part 62. A stiffening rod (reinforcing member) 64 is provided. The stiffening rod 64 is formed by cutting a straight bar-shaped reinforcing bar material to a predetermined length. The plurality of stiffening rods 64 respectively extend in the chord direction of the base ring portion 62 in plan view, and both end portions thereof are in contact with the inner peripheral surface of the base ring portion 62. Both ends of the stiffening rod 64 are fixed to the inner peripheral surface of the base ring portion 36 by welding or the like as necessary.

  As shown in FIG. 12 (B), the stiffening rods 64 are respectively arranged on the upper end side and the lower end side on the inner peripheral side of the base ring portion 62, and on the upper end side and the lower end side of the base ring portion 62. The pair of stiffening rods 64 to be disposed are disposed at the same position in plan view. In the present embodiment, four pairs of stiffening rods 64 are arranged on the inner peripheral side of the base ring portion 62. Both ends of the pair of stiffening rods 64 are in contact with both ends of arc portions 62A to 62D obtained by dividing the base ring 62 into four equal parts along the circumferential direction.

  Similarly to the joint rings 32 and 34, the joint ring 60 shown in FIG. 12 is also paired and fitted into the outer peripheral side of the connecting reinforcing bar group 58, and the crossed main reinforcing bars are interposed between the pair of base ring parts 62. 20 is pinched. At this time, the tip of the connecting hook portion 28 in the intersecting main reinforcing bar 20 is inserted to the inner peripheral side of the stiffening rod 64. In this state, the load transmission rod 44 or the straight rod portion 52 of the load transmission rod 50 is inserted inside the connecting hook portion 28 and on the inner peripheral side of the stiffening rod 64. As a result, a part of the transmission load from the intersecting main reinforcing bar 20 is transmitted to the joint ring 60 through the concrete layer and the stiffening rod 64, and the remaining part is directly transmitted to the pair of joint rings 60. The

  In the joint ring 60 shown in FIG. 12, a plurality of (8 in the present embodiment) stiffening rods 64 are arranged on the inner peripheral side of the base ring portion 62, and these stiffening rods 64 are arranged at both ends. When the load is transmitted from the intersecting main reinforcing bars 20 by contacting the both ends of the arc portions 62A to 62D, the transmitted load is distributed and transmitted over a wide range of the base ring portion 62 by the stiffening rod 64. In addition, since a part of the transmission load is also supported by the stiffening rod 64 on the inner peripheral side of the base ring portion 62, compared with the case where the joint ring 60 is configured by only the base ring portion 62, The bending rigidity of the joint ring 60 with respect to the load transmitted from the reinforcing bar 20 can be significantly increased. As a result, it is possible to effectively prevent the pair of joint rings 60 from being locally deformed by the transmission load from the intersecting main reinforcing bars 20.

  FIG. 13 shows a second modification of the joint ring in the joint structure 30 according to the present embodiment. The joint ring 70 is different from the joint ring 60 shown in FIG. 12 in that a rib-shaped diaphragm portion 72 is disposed between a pair of stiffening rods 64 disposed on the upper end side and the lower end side of the base ring portion 62, respectively. The other parts basically have the same configuration as the joint ring 60. As with the diaphragm portion 38 of the joint rings 32 and 34 shown in FIG. 3, the diaphragm portion 72 is joined to the inner peripheral surface of the base ring portion 62 by welding or the like over the entire circumference. ing.

  However, in the joining structure 30 using the joint ring 70, as in the case of using the joint rings 32 and 34 shown in FIG. 3, an insertion hole 46 is formed in the diaphragm portion 72, and a load is applied to the insertion hole 46. The straight rod portion 52 of the transmission rod 44 or the load transmission rod 50 may be inserted, and a pair of stiffening members may be used as in the case of using the joint ring 60 shown in FIG. The straight rod portion 52 of the load transmission rod 44 or the load transmission rod 50 may be inserted into the inner peripheral side of the rod 64 (diaphragm portion 72).

  In the joint ring 70 shown in FIG. 13, a plurality of (eight in this embodiment) stiffening rods 64 are arranged on the inner peripheral side of the base ring portion 62, and the diaphragm portion 72 is connected to the base ring portion 62. Bending of the joint ring 70 with respect to the load transmitted from the cross main reinforcing bar 20 as compared with the joint rings 32 and 34 shown in FIG. 3 and the joint ring 60 shown in FIG. Since the rigidity can be further increased, it is possible to more effectively prevent the pair of joint rings 70 from being locally deformed by the transmission load from the cross main reinforcing bars 20.

FIG. 14 shows a third modification of the joint ring in the joint structure 30 according to the present embodiment. The joint ring 80 includes a base ring portion 36 formed of a steel material having a substantially rectangular cross section, and a plurality of diaphragm portions 82 disposed on the outer peripheral side of the base ring portion 36. The diaphragm portion 82 is formed of a steel plate having a constant thickness, and is joined to the outer peripheral surfaces of the side portions 36A to 36D in the base ring portion 36 by welding or the like.
Here, the diaphragm portion 82 has a linear shape in which the outer peripheral end is formed in an arc shape having a constant radius of curvature and the inner peripheral end extends along the chord direction with respect to the arc-shaped outer peripheral end in plan view. Is formed. The diaphragm portion 82 has the entire inner peripheral end face joined to the outer peripheral surfaces of the side portions 36A to 36D.

  Similarly to the joint rings 32 and 34, the joint ring 80 shown in FIG. 14 is also paired and fitted on the outer peripheral side of the connecting reinforcing bar group 58, and the crossed main reinforcing bars are interposed between the pair of base ring portions 36. 20 is pinched. In this state, the load transmission rod 44 or the straight rod portion 52 of the load transmission rod 50 is inserted inside the connection hook portion 28 and on the inner peripheral side of the pair of base ring portions 36. Thereby, a part of transmission load from the crossing main reinforcing bar 20 is transmitted to the joint ring 80 through the concrete layer.

  In the joint ring 80 shown in FIG. 14, when the diaphragm portion 82 is joined to the outer peripheral surface of each of the side portions 36 </ b> A to 36 </ b> D in the base ring portion 36, the joint ring 80 is configured by only the base ring portion 62. As compared with the above, since the bending rigidity of the joint ring 80 with respect to the load transmitted from the intersecting main reinforcing bar 20 can be greatly increased, the pair of joint rings 80 are locally deformed by the transmitted load from the intersecting main reinforcing bar 20. Can be effectively prevented.

  Moreover, in the joint ring 80, each diaphragm part 82 is made into the shape (substantially crescent shape) from which the width | variety increases gradually toward the center side from the both ends of side part 36A-36D. On the other hand, when the load is transmitted from the intersecting main reinforcing bars 20, the width of the bending stress distribution in the side portions 36A to 36D gradually increases from both end portions toward the center side. Accordingly, by forming each diaphragm portion 82 in a substantially crescent shape, the bending rigidity of the joint ring 80 can be gradually increased from both ends of the side portions 36A to 36D toward the center side, so that a small amount of reinforcing material (diaphragm) The bending rigidity of the joint ring 80 can be efficiently increased by using the portion 82).

  FIG. 15 shows a fourth modification of the joint ring in the joint structure 30 according to the present embodiment. The joint ring 90 includes a base ring portion 36 formed of a steel material having a substantially rectangular cross section, and a plurality of anchor rods 92 protruding from the inner peripheral surface of the base ring portion 36. Here, the anchor rod 92 includes a round rod-like rod portion 94 and a diameter-expanded portion 96 formed integrally with the tip portion of the rod portion 94. The enlarged diameter portion 96 is formed in a thick disk shape, and the outer diameter thereof is larger than the outer diameter of the rod portion 94.

  The base portion of the rod portion 94 of the anchor rod 92 is fixed to the inner peripheral surfaces of the side portions 36A to 36D in the base ring portion 36 by welding or the like. At this time, the four rod portions 94 are respectively arranged in the longitudinal direction central portions of the inner peripheral surfaces of the four side portions 36A to 36D, and the horizontal cross section of the base ring portion 36 extends from the inner peripheral surfaces of the side portions 36A to 36D. Projects toward the center (center of gravity). Similarly to the joint rings 32 and 34, the joint ring 90 is also paired and inserted into the outer peripheral side of the connecting reinforcing bar group 58.

  As shown in FIG. 15A, by inserting the joint ring 90 into the outer peripheral side of the connecting reinforcing bar group 58, the tip ends of the four anchor rods 92 protrude to the inner peripheral side of the virtual boundary BL, respectively, and expand. A diameter portion 96 is inserted between the plurality of connecting portions 57. In this state, by molding the concrete molding 18 with concrete, the joint ring 90 is embedded in the concrete molding 18 together with the connecting reinforcing bar group 58.

In the joint ring 80 shown in FIG. 15, the anchor rods 92 protrude from the side portions 36 </ b> A to 36 </ b> D in the base ring portion 36, and the distal ends of these anchor rods 92 are respectively inserted between the plurality of connecting portions 57. As a result, the base ring part 36 can be joined to a plurality of anchor rods 92 (four in this example) and the connecting reinforcing bar group 58 having high rigidity via the concrete layer. The bending rigidity of the joint ring 80 with respect to the load transmitted from the intersecting main reinforcing bar 20 can be greatly increased as compared with the case where it does not exist, and the pair of joint rings 80 are locally deformed by the transmitted load from the intersecting main reinforcing bar 20. Can be effectively prevented.
In the joint ring 90, one anchor rod 92 is fixed to each of the side portions 36 </ b> A to 36 </ b> D in the base ring portion 36, but there are two anchor rods 92 depending on the magnitude of the load transmitted from the intersecting main reinforcing bars 20. The above anchor rods 92 may be fixed to the side portions 36A to 36D, respectively.

  FIG. 16 shows a fifth modification of the joint ring in the joint structure 30 according to the present embodiment. The joint ring 100 is different from the joint ring 90 shown in FIG. 15 in that the base ring part 36 is formed in a rectangular shape in the joint ring 90, whereas the base ring part 62 in the joint ring 100 is viewed in plan view. The other parts have the same configuration as the joint ring 90. In the joint ring 100, a plurality of (four in this example) anchor rods 92 are arranged on the inner peripheral surface of the base ring portion 62 at an equal pitch (90 ° pitch) along the circumferential direction.

  When the joint ring 90 shown in FIG. 15 is compared with the joint ring 100 shown in FIG. 16, the joint ring 90 joins the intersecting main reinforcing bar 20 to the reinforcing bar connecting portion 57 of the RC column 16 having a rectangular horizontal cross section. Whereas the joint ring 100 is suitable for the case, the joint ring 100 is suitable for joining the cross main reinforcing bars 20 to the reinforcing bar connecting portions 57 of the RC columns 16 having a substantially circular horizontal cross section.

FIG. 17 shows a sixth modification of the joint ring in the joint structure 30 according to the present embodiment. The joint ring 110 includes a base ring portion 36 formed of a steel material having a substantially rectangular cross section, and a plurality (two in this example) of stiffening disposed on the inner peripheral side of the base ring portion 36. A rod 112 is provided. Here, the stiffening rod 112 is made of a metal rod-like material such as steel, and both longitudinal ends thereof are brought into contact with the inner peripheral surface of the base ring portion 36, respectively.
Of the two stiffening rods 112, one stiffening rod 112 is fixed by welding or the like to the longitudinal center portions of the side portion 36A and the side portion 36B whose longitudinal ends are opposite to each other. The remaining one stiffening rod 112 is fixed by welding or the like to the longitudinal center portions of the side portion 36C and the side portion 36D, which are opposite to each other in the longitudinal direction.

  Similarly to the joint rings 32 and 34, the joint ring 110 shown in FIG. 17 is also inserted into the outer peripheral side of the connecting reinforcing bar group 58 as a pair. However, before the concrete molding 18 is molded from concrete, the pair of joint rings 110 must be fitted on the outer peripheral side of the connecting reinforcing bar group 58. Further, the load transmission rod 44 or the load transmission rod 50 also needs to be loaded into the connecting hook portion 28 of the intersecting main reinforcing bar 20 inserted between the pair of base ring portions 36 before the concrete forming column 26 is formed. is there.

  As shown in FIG. 17, by connecting the joint ring 110 to the outer peripheral side of the connecting reinforcing bar group 58, the two stiffening rods 112 pass between the plurality of connecting portions 57, respectively, and the connecting reinforcing bar group 58. To cross. In this state, by molding the concrete molding 18 with concrete, the joint ring 110 is joined to the connecting reinforcing bar group 58 via the two stiffening rods 112 and the concrete layer.

  In the joint ring 110, both ends of the stiffening rod 112 are fixed to the inner peripheral surfaces of the side portions 36 </ b> A to 36 </ b> D, respectively, and the stiffening rod 112 crosses the connecting reinforcing bar group 58, thereby A plurality of (two in this example) stiffening rods 112 can be joined to the connected reinforcing bar group 58 having high rigidity, and the load transmitted from the crossed main reinforcing bars 20 to the joint ring 110 by the stiffening rods 112 can be reduced. Since a part can be supported, the bending rigidity of the joint ring 110 with respect to the load transmitted from the cross main reinforcing bar 20 can be significantly increased as compared with the case where such a stiffening rod 112 is not present. It is possible to effectively prevent the pair of joint rings 110 from being locally deformed due to the transmission load from.

  In the joint ring 110, one stiffening rod 112 is bridged between the side portions 36 </ b> A and 36 </ b> B and between the side portions 36 </ b> C and 36 </ b> D in the base ring portion 36, but is transmitted from the cross main reinforcing bars 20. Two or more stiffening rods 112 are bridged between the side portions 36A and 36B and between the side portions 36C and 36D according to the magnitude of the load, and both ends of these stiffening rods 112 are connected to the side portions. You may make it adhere to the internal peripheral surface of 36A-36D.

  FIG. 18 shows a seventh modification of the joint ring in the joint structure 30 according to the present embodiment. The joint ring 120 is different from the joint ring 110 shown in FIG. 17 in that the base ring part 36 is formed in a rectangular shape in the joint ring 110, whereas the base ring part 62 is viewed in a plan view in the joint ring 120. The other parts have basically the same configuration as the joint ring 110. In the joint ring 120, a plurality of (two in this example) stiffening rods 112 are arranged on the inner peripheral side of the base ring portion 62 in a state of being orthogonal to the center of the base ring portion 62. Both end portions are respectively fixed to the inner peripheral surface of the base ring portion 62.

  When the joint ring 110 shown in FIG. 17 and the joint ring 120 shown in FIG. 18 are compared, the joint ring 110 joins the intersecting main reinforcing bar 20 to the connecting reinforcing bar group 58 of the RC column 16 having a rectangular horizontal cross section. In contrast, the joint ring 120 is suitable for joining the intersecting main reinforcing bars 20 to the connecting reinforcing bar group 58 of the RC column 16 having a substantially circular horizontal cross section.

  FIG. 19 shows an eighth modification of the joint ring in the joint structure 30 according to the present embodiment. The joint ring 130 differs from the joint ring 110 shown in FIG. 17 in that in the joint ring 110, the stiffening rod 112 is stretched between the side portions 36A and 36B and the side portions 36C and 36D facing each other. On the other hand, in the joint ring 130, the stiffening rod 112 is bridged between the side portions 36A and 36C adjacent to each other and between the side portions 36B and 36D. It is a point fixed to the longitudinal direction center part of the parts 36A and 36C and the longitudinal direction center part of the side parts 36B and 36D by welding or the like.

  Also in the joint ring 130 shown in FIG. 19, the base ring portion 36 has a high rigidity through a plurality of (four in this example) stiffening rods 112 and a concrete layer, similarly to the joint ring 110 shown in FIG. 17. And a part of the load from the crossing main reinforcing bar 20 can be supported by the stiffening rod 112, so that the bending rigidity of the joint ring 130 with respect to the load transmitted from the crossing main reinforcing bar 20 is greatly increased. This can effectively prevent the pair of joint rings 130 from being locally deformed by the transmission load from the intersecting main reinforcing bars 20.

[Second Embodiment]
(Composition structure)
FIG. 20 shows the configuration of the joint structure according to the second embodiment of the present invention. This joining structure 140 is applicable to the ramen viaduct 10 instead of the joining structure 30 according to the first embodiment shown in FIG. Note that in the joint structure 140 according to the present embodiment, the same parts as those of the joint structure 30 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

That is, the joint structure 140 according to the present embodiment connects the cross main reinforcing bars 20 arranged in the elevated beam 12 and the underground beam 14 in the ramen viaduct 10, similarly to the joint structure 30 according to the first embodiment. It joins to the reinforcing bar group 58 (RC column 16).
However, in the ramen viaduct 10 shown in FIG. 1, the connecting hook portion 28 that is curved in a U shape is formed at the tip of the intersecting main reinforcing bar 20, but the joining structure 140 according to this embodiment is applied. As shown in FIG. 20C, a hook-shaped head portion 142 is formed at the tip of the intersecting main reinforcing bar 20 in place of the connecting hook portion 28.

The head part 142 is formed in a disk shape having an outer diameter that is about three times the outer diameter of the reinforcing bar part 144 of the intersecting main reinforcing bar 20, and is arranged coaxially with the reinforcing bar part 144. Such a head portion 142 can be formed integrally with the intersecting main rebar 20 and can be fixed to the tip of the intersecting main rebar 20 by welding or the like.
As shown in FIG. 20B, the joint structure 140 is disposed on the upper side and the lower side of the intersecting main reinforcing bar 20 along the height direction, similarly to the joint structure 30 according to the first embodiment. A pair of joint rings 146 and 148 are provided. The joint ring 146 and the joint ring 148 have basically the same shape, and are configured by only the base ring portion 36 (see FIG. 3) formed in a rectangular shape in plan view.

  The pair of joint rings 146 and 148 are respectively inserted into the outer peripheral side of the connecting reinforcing bar group 58 and embedded in the concrete molding 18 together with the connecting reinforcing bar group 58. At this time, the pair of joint rings 146 and 148 arranged on the lower surface side in the underground beam 14 sandwich the distal end side of the lower main reinforcing bar 21 (crossed main reinforcing bar 20). Further, the pair of joint rings 146 and 148 arranged on the upper surface side in the underground beam 14 sandwich the tip side of the upper main reinforcing bar 22 (crossed main reinforcing bar 20).

  On the other hand, the pair of joint rings 146 and 148 disposed in the elevated beam 12 sandwich the distal end side of the lower main reinforcing bar 21 (crossed main reinforcing bar 20). The pair of joint rings 146 and 148 are fitted and inserted into the outer peripheral side of the connecting reinforcing bar group 58, and the charging of the intersecting main reinforcing bar 20 and the connecting reinforcing bar group 58 is completed by sandwiching the intersecting main reinforcing bar 20. At this time, the joint rings 146 and 148 are positioned such that the center (center of gravity) of the base ring portion 36 in the horizontal cross section substantially coincides with the central axis CP of the RC column 16.

  As shown in FIG. 20C, the joint structure 140 includes a load transmission spacer 150 that is loaded on the cross main reinforcing bar 20. Here, the load transmission spacer 150 is formed of a substantially circular iron plate material. The load transmitting spacer 150 is formed with an insertion groove 152 extending from one end of the outer peripheral surface to the other end along the radial direction. The fitting groove 152 is formed with a semicircular R-curved curved surface 154 at the tip opposite to the opening end, and the opening width of the portion excluding the curved surface 154 is the reinforcing bar portion 144. It is slightly larger than the outer diameter.

Here, as shown in FIG. 20 (B), when the distance D from the upper end surface to the lower end surface of the pair of joint rings 146 and 148 sandwiching the intersecting main reinforcing bars 20, the outer diameter of the load transmission spacer 150 is ( D × 1/2) or more. Further, the load transmission spacer 150 is loaded on the distal end side of the intersecting main reinforcing bar 20 by inserting the insertion groove 152 into the outer peripheral side of the reinforcing bar portion 144. At this time, the reinforcing bar portion 144 abuts on the curved surface 154 of the fitting insertion groove 152, and in this state, the center of the load transmission spacer 150 is substantially the same as the reinforcing bar axis SR of the intersecting main reinforcing bar 20 (see FIG. 20C). Match.
The thickness of the load transmission spacer 150 is appropriately set according to the magnitude of the load transmitted from the intersecting main reinforcing bar 20, but when only one load transmission spacer 150 cannot withstand the transmission load. Two or more load transmission spacers 150 may be loaded on one crossed main reinforcing bar 20.

  As shown in FIGS. 20A and 20B, the load transmission spacer 150 is loaded on the distal end side of the cross main reinforcing bar 20 sandwiched between the pair of joint rings 146 and 148. Specifically, the load transmission spacer 150 is a part on the proximal end side with respect to the head part 142 in the reinforcing bar part 144 and is connected to the inner peripheral part of the pair of joint rings 146 and 148.

  At this time, it is preferable that the load transmission spacer 150 is separated from the head portion 142 along the reinforcing bar axis direction and also from the inner peripheral surfaces of the joint rings 146 and 148. By arranging in this way, the load from the head part 142 is transmitted to a wide range of the load transmission spacer 150 through the concrete (concrete layer) as compared with the case where the load transmission spacer 150 is brought into contact with the head part 142. The deformation of the load transmission spacer 150 can be suppressed. However, when a sufficient space cannot be secured between the head portion 142 and the inner peripheral surface of the joint ring 146.148 along the reinforcing bar axis direction, the load transmission spacer 150 is attached to the head to prevent the concrete layer from collapsing. You may make it contact | abut to the part 142. FIG.

  In the joint structure 140, the pair of joint rings 146 and 148, the tip side including the head portion 142 of the crossing main reinforcing bar 20, and the load transmission spacer 150 are arranged on the outer peripheral side of the connecting reinforcing bar group 58. It is embedded in the molded product 18. Thereby, since the cross main rebar 20 is joined to the connection rebar group 58 (RC column 16) by the joint structure 140, when a load is transmitted from the outside to the arbitrary cross main rebar 20 or internal stress acts, Part of the load (compressive load or tensile load) transmitted to the intersecting main reinforcing bar 20 is applied to the RC column 16 via the load transmitting spacer 150, the pair of joint rings 146 and 148, and the concrete layer interposed therebetween. Communicated. At this time, the projected area of the load transmission spacer 150 on the pair of joint rings 146 and 148 along the reinforcing bar axis direction is larger than the projected area of the head portion 142 on the joint rings 146 and 148 in the cross main reinforcing bar 20.

  The timing of loading the load transmission spacer 150 into the cross main reinforcing bar 20 is preferably the time before the concrete is placed after the cross main reinforcing bar 20 is sandwiched between the pair of joint rings 146 and 148. Immediately after the assembly of the lower main reinforcing bar 21 or the upper main reinforcing bar 22 (crossing main reinforcing bar 20) is completed, the load transmission spacer 150 is loaded into the crossing main reinforcing bar 20 by inserting the ring 148 into the outer peripheral side of the connecting reinforcing bar group 58. May be.

(Operation of bonding structure)
Next, the operation of the joint structure 140 according to this embodiment will be described. In the joint structure 140 according to the present embodiment, the load transmission spacer 150 is connected to a portion (reinforcing bar portion 144) between the head portion 142 and the pair of joint rings 146 and 148 in the intersecting main reinforcing bar 20, thereby A load (compressive load or tensile load) from the reinforcing bar 20 can be transmitted to the pair of joint rings 146 and 148 through the concrete layer and the load transmission spacer 150 in a substantially uniform manner, and the pair of joint rings 146 and 148 can be transmitted. It can be transmitted to the RC pillar 16 via.

  At this time, the projected area of the load transmission spacer 150 on the pair of joint rings 146 and 148 along the reinforcing bar axis direction is larger than the projected area of the head portion 142 of the cross main reinforcing bar 20 on the joint rings 146 and 148. Thus, the load from the intersecting main reinforcing bars 20 can be evenly distributed and transmitted to the pair of joint rings 146 and 148 through the concrete layer and the load transmission spacer 150 and wide along the circumferential direction of each joint ring 146 and 148. Since it can be distributed and transmitted in the region, it is possible to effectively prevent the pair of joint rings 146 and 148 from being locally deformed by the transmission load from the intersecting main reinforcing bars 20.

As a result, according to the joint structure 140 according to the present embodiment, the pair of joint rings 146 and 148 can be effectively prevented from being locally deformed by the transmission load from the intersecting main reinforcing bars 20, so that the joint ring 146, It can also be effectively prevented that the transmission efficiency of the load transmitted from the intersecting main reinforcing bar 20 to the RC column 16 is reduced due to the deformation of 148.
Further, in the joint structure 140, the load transmission spacer 150 can be loaded into the cross main reinforcing bar 20 by simply inserting the load transmission spacer 150 into the reinforcing bar portion 144 of the cross main reinforcing bar 20 from above before placing the concrete. Thus, the load transmission spacer 150 does not fall off, so that the loading operation of the load transmission spacer 150 for transmitting the load between the cross main reinforcing bar 20 and the pair of joint rings 146 and 148 can be made extremely simple.

(Modification of joint ring)
Next, a modification of the annular member (joint ring) used in the joint structure 140 according to the present embodiment will be described. In the joint structure 140 according to the present embodiment, in addition to the joint rings 146 and 148 shown in FIG. 20, the joint rings 80, 90, 100, 110, 120 already described in the joint structure 30 according to the first child form are used. , 130 (see FIGS. 14 to 19) can be used as the annular member. Also in this case, the pair of joint rings 80, 90, 100, 110, 120, and 130 are inserted into the outer peripheral side of the connecting reinforcing bar group 58, and the pair of joint rings 80, 90, 100, and 110 are inserted. , 120 and 130, the intersecting main reinforcing bar 20 is sandwiched. At this time, the head portion 142 in the intersecting main reinforcing bar 20 is inserted to the inner peripheral side of the joint rings 80, 90, 100, 110, 120, and 130. In this state, the load transmission spacer 150 is inserted into the portion (reinforcing bar portion 144) between the joint rings 80, 90, 100, 110, 120, and 130 in the cross main reinforcing bar 20 from above and connected. Thereby, the transmission load from the crossing main reinforcing bars 20 can be transmitted to the pair of joint rings 80, 90, 100, 110, 120, 130 via the concrete layer and the load transmission spacer 150.

  Therefore, in the joint structure 140 according to the present embodiment, even when the joint rings 80, 90, 100, 110, 120, and 130 are used as the annular members, the load from the cross main reinforcing bar 20 is applied to the pair of joint rings 80 and 90. , 100, 110, 120, 130 can be evenly distributed and transmitted in the circumferential direction of each joint ring 80, 90, 100, 110, 120, 130. It is possible to effectively prevent the joint rings 80, 90, 100, 110, 120, and 130 from being locally deformed by the transmission load.

At this time, the joint rings 80, 90, 100, 110, 120, and 130 have higher bending rigidity along the circumferential direction than the joint rings 146 and 148, and thus more effectively. The joint rings 80, 90, 100, 110, 120, and 130 can prevent local deformation.
In the joint structure 140 according to the present embodiment, a substantially disk-shaped load transmission spacer 150 is used. However, as such a load transmission spacer, for example, a rectangular shape may be used. Further, a rod-shaped material such as a reinforcing bar material curved in a U shape may be used. In short, any shape can be used as long as it can be reliably connected to the reinforcing bar portion 144 of the intersecting main reinforcing bar 20 and the projected area of the pair of joint rings can be larger than the projected area of the head portion 142.

Also, when using a joint ring in which the base ring part is curved with a constant radius of curvature, the radius of curvature of the base ring part is used as a load transmission spacer in order to level the magnitude of the load transmitted to the joint ring. A curved portion having a curvature radius corresponding to may be used.
In addition, for the joint rings 90, 100, 110, 120, and 130, it is possible to increase the bending rigidity by joining a rib-shaped diaphragm portion to one of the inner and outer peripheral surfaces of the base ring portions 36 and 62 by welding or the like. However, in order to avoid interference with the connecting reinforcing bar group 58, it is preferable to join the diaphragm portion to the outer peripheral surfaces of the base ring portions 36 and 62. As for the shape of the diaphragm portion, a substantially crescent-shaped base ring portion 36 shown in FIG. 14 is suitable for the substantially square base ring portion 36, and a circular base ring portion 62 has an annular shape such as a thin disc shape. Is suitable.

[Third embodiment]
(Composition structure)
FIG. 21 shows the configuration of the joint structure according to the third embodiment of the present invention. These joining structures 160 can be applied to the ramen viaduct 10 instead of the joining structure 30 according to the first embodiment. Note that in the joint structure 160 according to the present embodiment, the same parts as those of the joint structure 30 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

Similar to the joint structure 30 according to the first embodiment, the joint structure 160 according to the present embodiment connects the cross main reinforcing bars 20 arranged in the elevated beam 12 and the underground beam 14 in the ramen viaduct 10 to connect the reinforcing bars. 58 (RC column 16).
However, in the joint structure 30 according to the first embodiment, a pair (two pieces) of the joint rings 32 and 34 are used to join the plurality of intersecting main reinforcing bars 20 to the connecting reinforcing bar group 58. The joint structure 160 according to the embodiment is different from the joint structure 30 according to the first embodiment in that only one joint ring 162 is used to join a plurality of intersecting main reinforcing bars 20 to the connecting reinforcing bar group 58. ing.

  A joint structure 160 shown in FIG. 21A includes a joint ring 162 that is disposed on the upper side or the lower side (lower side in the present embodiment) of the intersecting main reinforcing bar 20. The joint ring 162 is configured only by a base ring portion 36 (see FIG. 3) formed in a rectangular shape in plan view. The joint ring 162 is fitted on the outer peripheral side of the connecting reinforcing bar group 58 and is embedded in the concrete molding 18 together with the connecting reinforcing bar group 58. At this time, the joint ring 162 abuts against the distal end side of the intersecting main reinforcing bar 20 from below, and supports the distal end side of the intersecting main reinforcing bar 20 from below. The joint ring 162 is positioned so that the center (center of gravity) of the base ring portion 36 in the horizontal cross section substantially coincides with the central axis CP of the RC column 16.

  A connecting hook portion 28 that is curved in a U-shape is formed at the distal end portion of the intersecting main reinforcing bar 20. The connection hook portion 28 is in a state (hanging state) where the joint ring 162 is hooked. Here, the latching state means that the reinforcing bar material on which the connecting hook portion 28 is formed is wound around the inner peripheral side of the steel rod on which the joint ring 162 (base ring portion 36) is formed by a half or more. As a result, the movement of the connecting hook portion 28 in the outer peripheral side and in the vertical direction is restricted, so that the connecting hook portion 28 falls off the joint ring 162 even when an excessive tensile load acts on the cross main reinforcing bars 20. Can be effectively prevented.

The distal end of the connecting hook portion 28 is inserted to the inner peripheral side of the joint ring 162. As a result, a gap is formed between the inner peripheral surface of the joint ring 162 and the inner peripheral end of the connecting hook portion 28. Further, as shown in FIG. 21B, the connecting hook portion 28 is disposed so as to be inclined with respect to the central axis CP when viewed from the outside in the reinforcing bar axis direction along the reinforcing bar axis SR.
The joint structure 160 includes a straight rod-shaped load transmission rod 44 that is loaded into the connection hook portion 28 of the intersecting main reinforcing bar 20. The load transmission rod 44 is disposed inside the U-shaped connecting hook portion 28 so as to pass through the inner peripheral side of the joint ring 162. At this time, as shown in FIG. 21B, the load transmission rod 44 obliquely crosses the side portions 36 </ b> A to 36 </ b> D (the side portion 36 </ b> A in FIG. 21) of the joint ring 162 when viewed from the outside in the reinforcing bar axial direction. To do. Here, when the inclination angle of the load transmission rod 44 with respect to the central axis CP of the RC column 16 is θ, the inclination angle θ is preferably set to an angle close to 90 °.

  In the joining structure 160, the load transmission rod 44 and the connecting hook portion 28 and the connecting hook portion 28 and the joint ring 162 are finally joined to each other by a concrete layer interposed therebetween. However, before the concrete is placed, in order to prevent the displacement and dropout of the load transmission rod 44 with certainty, for example, a wire is wound around the load transmission rod 44 and the vicinity of the distal end portion of the connecting hook portion 28 so that the load transmission rod 44 is The connection hook portion 28 may be temporarily fixed, or the load transmission rod 44 and the vicinity of the distal end portion of the connection hook portion 28 may be temporarily fixed by a metal clip.

  In the joint structure 160, the joint ring 162, the distal end side of the intersecting main reinforcing bar 20, and the load transmission rod 44 are respectively arranged on the outer peripheral side of the connecting reinforcing bar group 58, and are embedded in the concrete molding 18 together with the connecting reinforcing bar group 58. . Thereby, since the cross main reinforcing bar 20 is joined to the connecting reinforcing bar group 58 (RC column 16) by the joining structure 160, when a load is transmitted from the outside to the arbitrary crossing main reinforcing bars 20 or internal stress acts, A part of the load (compressive load or tensile load) transmitted to the intersecting main reinforcing bar 20 is transmitted to the RC column 16 via the load transmitting rod 44, the joint ring 162, and the concrete layer interposed therebetween. At this time, the projected area of the connecting hook portion 28 and the load transmitting rod 44 along the reinforcing bar axis direction on the joint ring 162 is naturally larger than the projected area of the connecting hook portion 28 on the cross main reinforcing bar 20 on the joint ring 162.

(Operation of bonding structure)
Next, the effect | action of the joining structure 160 which concerns on this embodiment is demonstrated. In the joint structure 160 according to the present embodiment, the projected area of the connecting hook portion 28 and the load transmission rod 44 along the reinforcing bar axial direction with respect to the joint ring 162 is the projected area of the connecting hook portion 28 of the intersecting main reinforcing bar 20 with respect to the joint ring 162. Therefore, compared with the case where the cross main reinforcing bar 20 is connected to the joint ring 162 only by hooking the joint ring 162 by the connecting hook portion 28, the load from the cross main reinforcing bar 20 is reduced to the joint ring. Since it can be distributed and transmitted in a wide area along the circumferential direction of 162, it is possible to effectively prevent the joint ring 162 from being locally deformed by the transmission load from the cross main reinforcing bar 20.
As a result, according to the joint structure 160 according to the present embodiment, it is possible to effectively prevent one joint ring 162 from being locally deformed by a transmission load from the intersecting main reinforcing bars 20, and thus the deformation of the joint ring 162 is prevented. Accordingly, it is possible to effectively prevent the transmission efficiency of the load transmitted from the intersecting main reinforcing bar 20 to the RC column 16 from being lowered.

  In the joining structure 160, the load transmission rod 44 is inserted inside the connecting hook portion 28 of the crossed main reinforcing bar 20 before placing concrete, and the load transmitting rod 44 is temporarily fixed to the connecting hook portion 28 as necessary. Thus, the load transmission rod 44 can be loaded into the cross main reinforcing bar 20, so that the loading operation of the load transmission rod 44 for transmitting a load between the cross main reinforcing bar 20 and the joint ring 162 can be made extremely simple.

  Further, in the joint structure 160 according to the present embodiment, in addition to the joint ring 162 shown in FIG. 21 as an annular member, the joint rings 80, 90, 100, 110, 120, and 130 shown in FIGS. Any one of them can be used, and by using any one of the joint rings 80, 90, 100, 110, 120, and 130, one joint ring 80, 90, 100, 110 is transmitted by the transmission load from the cross main reinforcing bar 20. , 120 and 130 can be more effectively prevented from being locally deformed.

  In the joint structure 160 according to the present embodiment, only one load transmission rod 44 is loaded into one connection hook portion 28, but two or more load transmission rods 44 are attached to one connection hook portion 28. May be loaded. At this time, it is possible to arrange two or more load transmission rods 44 so as to be parallel to each other, and to load the two load transmission rods 44 into the connecting hook portion 28 so as to intersect in an X shape. May be. In addition to the load transmission rod 44 formed of a reinforcing bar material, the load transmission member may be a long steel plate material cut into a predetermined length (load transmission plate) or a non-circular shaped steel rod having a predetermined cross section. What was cut | disconnected to length can also be used.

  In the joining structure 160, a load transmitting rod 50 (see FIG. 11) curved in a U shape may be used. In this case, the load transmission rod 50 is disposed so as to straddle the joint ring 162 from above, and the straight rod portion 52 of the load transmission rod 50 is inside the connecting hook portion 28 and is on the inner peripheral side of the joint ring 162. Plugged into. As a result, the work of temporarily fixing the load transmission rod 44 to the connecting hook portion 28 can be made unnecessary, so that the loading operation of the load transmitting rod 50 to the connecting hook portion 28 can be made extremely easy.

  In addition, for the joint rings 90, 100, 110, 120, and 130, it is possible to increase the bending rigidity by joining a rib-shaped diaphragm portion to one of the inner and outer peripheral surfaces of the base ring portions 36 and 62 by welding or the like. However, in order to avoid interference with the connecting hook portion 28, the load transmission rod 44 and the connecting reinforcing bar group 58, it is preferable to join the diaphragm portion to the outer peripheral surfaces of the base ring portions 36 and 62. As for the shape of the diaphragm portion, a substantially crescent-shaped base ring portion 36 shown in FIG. 14 is suitable for the substantially square base ring portion 36, and a circular base ring portion 62 has an annular shape such as a thin disc shape. Is suitable.

[Fourth Embodiment]
(Composition structure)
FIG. 22 shows the configuration of the joint structure according to the fourth embodiment of the present invention. These joining structures 170 can be applied to the ramen viaduct 10 instead of the joining structure 30 according to the first embodiment. Note that in the joint structure 170 according to the present embodiment, the same parts as those of the joint structure 30 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The joint structure 170 according to the present embodiment joins the elevated beam 12 and the underground beam 14 in the ramen viaduct 10 to the RC column 16 in the same manner as the joint structure 30 according to the first embodiment. That is, the joint structure 170 according to the present embodiment connects the intersecting main reinforcing bars 20 arranged in the elevated beam 12 and the underground beam 14 in the ramen viaduct 10, similarly to the joint structure 30 according to the first embodiment. It joins to the reinforcing bar group 58 (RC column 16).

  However, in the ramen viaduct 10 shown in FIG. 1, the lower main reinforcement 21 arranged in the elevated beam 12, the lower main reinforcement 21 and the upper main reinforcement 22 arranged in the underground beam 14 are respectively 2 In the ramen viaduct 10 to which the joining structure 170 of the present embodiment is applied, the lower main reinforcing bar 21 of the elevated beam 12, the lower main reinforcing bar 21 of the underground beam 14, and the upper main beam are used. It is assumed that at least one of the reinforcing bars 22 is configured in a three-dimensional lattice shape, or a plurality of reinforcing bar groups combined in a two-dimensional lattice shape are stacked.

  In the joint structure 30 according to the first embodiment, a pair (two) of the joint rings 32 and 34 are used to join the plurality of intersecting main reinforcing bars 20 to the connecting reinforcing bar group 58. The joint structure 170 according to the present embodiment differs from the joint structure 30 according to the first embodiment in that only one joint tube 172 is used as an annular member for joining a plurality of intersecting main reinforcing bars 20 to the connecting reinforcing bar group 58. ing.

  The joint structure 170 according to the present embodiment includes a joint cylinder 172 interposed between the intersecting main reinforcing bars 20 arranged at different positions along the height direction of the viaduct. The joint cylinder 172 is formed in a cylindrical shape, and is manufactured, for example, by cutting a thick steel pipe into a length corresponding to the height direction pitch of the intersecting main reinforcing bars 20. The joint cylinder 172 is fitted on the outer peripheral side of the connecting reinforcing bar group 58 and is embedded in the concrete molding 18 together with the connecting reinforcing bar group 58. At this time, the joint cylinder 172 abuts the upper end surface of the joint main bar 20 on the front end side of the cross main reinforcing bar 20 positioned on the upper side in the height direction, and the front end side of the cross main reinforcing bar 20 positioned on the lower side. Abut. The joint cylinder 172 is positioned so that the center (center of gravity) in the horizontal cross section substantially coincides with the center axis CP of the RC column 16.

  The distal end of the connecting hook portion 28 is inserted to the inner peripheral side of the joint cylinder 172. As a result, a gap is formed between the inner peripheral surface of the joint cylinder 172 and the inner peripheral end of the connecting hook portion 28. The joint structure 170 includes a straight rod-shaped load transmission rod 44 loaded in the connection hook portion 28 of the pair of upper and lower cross main reinforcing bars 20. The load transmission rod 44 is disposed inside the U-shaped connecting hook portion 28 so as to pass through the inner peripheral side of the joint cylinder 172. At this time, the center axis of the load transmission rod 44 is substantially parallel to the center axis CP of the RC column 16. The total length of the load transmission rod 44 is longer than the length of the joint cylinder 172, and both end portions thereof protrude from both end surfaces of the joint cylinder 172.

  In the joint structure 170, the load transmission rod 44 and the connection hook portion 28 and the connection hook portion 28 and the joint cylinder 172 are finally joined to each other by a concrete layer interposed therebetween. However, before the concrete is placed, in order to prevent the displacement and dropping of the load transmission rod 44, for example, a wire is wound around the tip of the load transmission rod 44 and the connecting hook portion 28, and the load transmitting rod 44 is connected to the connecting hook. It may be temporarily fixed to the portion 28, or may be temporarily fixed by sandwiching the load transmission rod 44 and the vicinity of the distal end portion of the connecting hook portion 28 with a metal clip. Further, the upper end portion of the load transmission rod 44 is provided with a flange portion having a width wider than the width of the connection hook portion 28, and the flange portion is abutted against the upper connection hook portion, whereby the load transmission rod 44 is displaced. You may make it prevent dropout.

  In the joint structure 170, the joint cylinder 172, the distal end side of the intersecting main reinforcing bar 20, and the load transmission rod 44 are arranged on the outer peripheral side of the reinforcing bar connecting part 57, and are embedded together with the reinforcing bar connecting part 57 in the concrete molding 18. . Thereby, since the cross main reinforcing bar 20 is joined to the reinforcing bar connecting portion 57 (RC column 16) by the joining structure 170, when a load is transmitted from the outside to the arbitrary crossing main reinforcing bar 20 or internal stress acts, A part of the load (compression load or tensile load) transmitted to the intersecting main reinforcing bar 20 is transmitted to the RC column 16 via the load transmitting rod 44, the joint cylinder 172, and the concrete layer interposed therebetween.

(Operation of bonding structure)
Next, the operation of the joint structure 170 according to this embodiment will be described. In the joint structure 170 according to the present embodiment, the load from the pair of upper and lower intersecting main reinforcing bars 20 is transmitted to the joint cylinder 172 via the load transmission rod 44 and the concrete layer. Since it can disperse | distribute and transmit to the wide area | region extended along the height direction in 172, it can prevent effectively that the joint pipe | tube 172 deform | transforms locally by the transmission load from the cross main reinforcing bar 20. FIG.
As a result, according to the joint structure 170 according to the present embodiment, it is possible to effectively prevent the joint tube 172 from being locally deformed by the transmission load from the intersecting main reinforcing bars 20, so that the joint tube 172 is deformed. It can also be effectively prevented that the transmission efficiency of the load transmitted from the intersecting main reinforcing bar 20 to the RC column 16 is lowered.

  Further, in the joint structure 170, before placing concrete, the load transmission rod 44 is inserted inside the connecting hook portion 28 of the crossed main reinforcing bar 20, and the load transmitting rod 44 is temporarily fixed to the connecting hook portion 28 as necessary. Thus, the load transmission rod 44 can be loaded into the cross main reinforcing bar 20, so that the loading operation of the load transmission rod 44 for transmitting a load between the cross main reinforcing bar 20 and the joint cylinder 172 can be made extremely simple.

  Note that, in the joint structure 170 according to the present embodiment, in addition to the cylindrical joint cylinder 172, for example, a substantially square cylindrical joint cylinder can be used as the annular member. Further, in the joint structure 170 according to the present embodiment, only one load transmission rod 44 is loaded on the connection hook portion 28 of the pair of upper and lower cross main reinforcing bars 20, but two or more load transmission rods 44 are paired with the upper and lower pairs. You may load in the connection hook part 28 of the crossing main reinforcement 20, respectively. Thereby, since it becomes possible to expand the area | region where a load is transmitted from the crossing main reinforcement 20 in the joint pipe | tube 172 to the circumferential direction, the local deformation | transformation of the joint pipe | tube 172 can be prevented still more effectively. In addition to the load transmission rod 44 formed of a reinforcing bar material, the load transmission member may be a long steel plate material cut into a predetermined length (load transmission plate) or a non-circular shaped steel rod having a predetermined cross section. What was cut into length (load transmission plate) can also be used.

  In the joining structure 170, a load transmitting rod 50 (see FIG. 11) curved in a U shape may be used. In this case, the load transmission rod 50 is arranged so as to straddle the joint cylinder 172 from above, and the straight rod portion 52 of the load transmission rod 50 is inside the connecting hook portion 28 and is on the inner peripheral side of the joint cylinder 172. Plugged into. As a result, the work of temporarily fixing the load transmission rod 44 to the connecting hook portion 28 can be made unnecessary, so that the loading operation of the load transmitting rod 50 to the connecting hook portion 28 can be made extremely easy.

  Next, when the ramen viaduct 10 is actually constructed using the joining structure 30 according to the first embodiment of the present invention, specifications of components used for the joining structure 30 will be described as examples. However, for the components used in the joint structure 30, the dimensions, strength, etc. vary depending on the scale of the building to be applied, the expected load, etc. It is not limited to the data shown in the examples.

  In the joint structure 30 according to the present embodiment, the RC pillar 16 is a concrete pillar 26 having an outer diameter of 800 mm, and 30 to 40 D32 column main reinforcing bars 25 are arranged inside the concrete pillar 26. did. Each of the elevated beam 12 and the underground beam 14 has a substantially square cross section with a dimension of 1200 mm in the bridge width direction and a dimension of 1200 mm in the height direction, and a length along the axis of the bridge of 10 m. I built something.

  In the elevated beam 12 and the underground beam 14, twelve main reinforcing bars (the lower main reinforcing bar 21 and the upper main reinforcing bar 22) are embedded in the concrete molding 18 along the bridge axis direction. Eight of them extend to the vicinity of the outer peripheral surface of the steel pipe column 16 as the intersecting main reinforcing bars 20. Here, the main reinforcing bar has a size of D32, and the intersecting main reinforcing bar 20 has a U-shaped connecting hook portion 28 formed at the tip thereof.

As the joint rings 32 and 34, those having a substantially rectangular shape with an outer diameter dimension of 1000 mm along the bridge width direction and an outer diameter dimension of 1000 mm along the bridge axis direction are used, and the base ring portion 36 in the joint rings 32 and 34 is used. Was formed of a steel rod having a rectangular cross section of 90 mm × 90 mm. The diaphragm portion 38 joined to the inner peripheral surface of the base ring portion 36 was formed of a steel plate having a plate thickness of 16 mm, and a circular opening 40 was formed in the center portion thereof. In addition, two insertion holes 46 are formed in the diaphragm portion 38 with respect to one intersecting main reinforcing bar 20.
The load transmission rods 44 and 50 through which the insertion hole 46 of the diaphragm portion 38 is inserted are obtained by cutting a D32 reinforcing bar material to a predetermined length, or cutting a D32 reinforcing bar material to a predetermined length to be U-shaped. The one curved in a shape was used.

10 Ramen viaduct 12 Elevated beam (load support)
14 Underground beam (load support)
16 RC (Reinfoced-Concrete) pillar (post)
17 outer peripheral surface 18 concrete molding 20 cross main reinforcing bar 21 lower main reinforcing bar 22 upper main reinforcing bar 24 column main reinforcing bar 25 column main reinforcing bar group 26 concrete forming column 28 connecting hook part 30 joint structure 32, 34 joint ring 36 base ring part 36A , 36B, 36C, 36D Side 40 Circular opening 42 Bending part 44 Load transmission rod 46 Insertion hole 48 Concrete layer 50 Load transmission rod 52, 54 Straight bar part 56 Connecting hook part 60 Joint ring 62 Base ring part 64 Reinforcing bar Element)
70 Joint Ring 72 Diaphragm Part 80 Joint Ring 82 Diaphragm Part 90 Joint Ring 92 Anchor Rod (Anchor Part)
94 Rod part 96 Expanded diameter part 100 Joint ring 110 Joint ring 112 Stiffening rod 120 Joint ring 130 Joint ring 140 Joint structure 142 Head part 144 Reinforcing bar part 146 Joint ring 148 Joint ring 150 Load transmission spacer 152 Insertion groove 154 Curved surface 160 Joint structure 162 Joint ring 162 Joint cylinder BL Virtual boundary

Claims (3)

Reinforced concrete load support having a plurality of main reinforcing bars, a concrete forming column, and a plurality of reinforcing bars embedded in the concrete forming column and arranged to extend in the axial direction A reinforced concrete supporting column having a column main reinforcing bar group, and a bonded structure for connecting the load support to the supporting column.
A part of the column main reinforcing bar group is provided so as to protrude from the concrete-formed column along the axial direction, and a connecting reinforcing bar group embedded in the load support,
A hook-shaped connection hook portion provided at each of the front end portions of the plurality of main reinforcing bars extending from the outer peripheral side of the connection reinforcing bar group of the load support to the center side;
A pair of annular members that are arranged on the outer peripheral side of the connecting reinforcing bar group, are embedded in the load support body together with the connecting reinforcing bar group, and sandwich the tip side including the connecting hook portion in the main reinforcing bar of the load supporting body. When,
A load transmitting member disposed inside the connecting hook portion sandwiched between the pair of annular members and inserted through the inner peripheral side of the pair of annular members;
A joint structure between a load support and a support, characterized by comprising: Reinforced concrete load support having a plurality of main reinforcing bars, a concrete forming column, and a plurality of reinforcing bars embedded in the concrete forming column and arranged to extend in the axial direction A reinforced concrete supporting column having a column main reinforcing bar group, and a bonded structure for connecting the load support to the supporting column.
A part of the column main reinforcing bar group is provided so as to protrude from the concrete forming column along the axial direction, and a connecting reinforcing bar group embedded in the concrete molding,
A hook-shaped head portion provided at each of the front end portions of a plurality of main reinforcing bars extending from the outer peripheral side of the connecting reinforcing bar group of the load support to the center side;
A pair of annular members disposed on the outer peripheral side of the connecting reinforcing bar group, embedded in the load support body together with the connecting reinforcing bar group, and sandwiching the tip side of the main reinforcing bar;
A load transmitting member that is connected to a front end side of a main reinforcing bar of the load support body sandwiched between a pair of the annular members and interposed between the head portion and the pair of annular members;
A structure for joining a load support body and a support body characterized by comprising: Reinforced concrete load support having a plurality of main reinforcing bars, a concrete forming column, and a plurality of reinforcing bars embedded in the concrete forming column and arranged to extend in the axial direction A reinforced concrete supporting column having a column main reinforcing bar group, and a bonded structure for connecting the load support to the supporting column.
A part of the column main reinforcing bar group is provided so as to protrude from the concrete-formed column along the axial direction, and a connecting reinforcing bar group embedded in the load support,
An annular member disposed on the outer peripheral side of the connected reinforcing bar group and embedded in the load support,
A collar that is provided at each of the tip ends of a plurality of main reinforcing bars extending from the outer peripheral side to the center side of the connecting reinforcing bar group of the load support, and at least a part of which is inserted into the inner peripheral side of the annular member And a connecting hook part
A load transmitting member disposed inside the connecting hook portion and inserted through the inner peripheral side of the annular member;
A structure for joining a load support body and a support body characterized by comprising:

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