JP2013040484A - Load support and support body joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load support and support body joint structure capable of effectively preventing the deformation of annular members by transmitting a load from a reinforcement via a load transmission member to wide regions of the annular members in a distributive manner, and of simplifying work for loading the load transmission member.SOLUTION: A joint structure 30 includes annular members 32, 34 arranged inside load supports 12, 14 on the outer periphery side of a support body 16, an anchorage end part provided on at least one intersection main reinforcement 20 out of a plurality of reinforcements intersecting the support body 16 and located between each of the annular members 32, 34 and the outer peripheral face of the support body 16, and a load transmission member 44 arranged between each of the annular members 32, 34 and the anchorage end part.

Description

  The present invention relates to a joint structure between a load support body and a column body, which joins a reinforced concrete load support body constituting a beam, a floor, etc. in a structure such as a viaduct to a column body.

  As a joint structure between a load support body and a support body applied to various buildings, 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. A fixing plate having a T-shaped cross section sandwiched between the two, and a main reinforcing bar is fixed to the end of the fixing plate protruding from between the pair of annular members to the outer peripheral side by welding. 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 an excessive load is applied to a building including a flat slab, the ring is moved inside the slab. There is a risk of local deformation of the shaped member.

Further, in the joint structure described in Patent Document 2, since the tip of the main reinforcing bar must be welded to the end of the fixing plate sandwiched between the pair of fixing rings at the construction site, the work is very troublesome. become.
The object of the present invention is to effectively prevent deformation of the annular member by dispersing the load transmitted from the reinforcing bar through the load transmitting member and transmitting it to a wide area of the annular member in consideration of the above fact, and An 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 a load transmission member.

  According to the first aspect of the present invention, the load support body and the support structure are bonded to each other by a reinforced concrete load support body including a plurality of reinforcing bars, and an outer peripheral portion formed of a steel pipe. And a structure in which a part along the axial direction is embedded in a column body, and an annular member disposed on the outer peripheral side of the column body inside the load support body and a direction intersecting the column body A fixing end that is provided between at least one of the plurality of reinforcing bars disposed between the annular member and the outer peripheral surface of the support, and the annular member and the fixing end. And a load transmission member disposed therebetween.

  In such a joint structure between the load support body and the support body, the load transmitting member includes an annular member disposed on the outer peripheral side of the support body within the load support body and a plurality of members disposed in a direction intersecting the support body. The load (compressive load or tensile load) from the reinforcing bar is provided on at least one of the reinforcing bars, and is arranged between the annular member and the fixing end located between the outer peripheral surfaces of the support columns. ) Can be transmitted to the annular member through the concrete layer and the load transmitting member interposed between the fixing end portion and the annular member, and can be transmitted to the column body through the annular member.

At this time, if the projected area for the annular member of the load transmitting member along the transmission direction of the load transmitted from the reinforcing bar is larger than the projected area for the annular member of the reinforcing bar, without using such a load transmitting member, Compared with the case where the reinforcing bar is joined to the annular member, the load from the reinforcing bar 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 local deformation.
Therefore, it is possible to effectively prevent the annular member from being locally deformed by the transmission load from the reinforcing bar, and therefore, it is effective that the transmission efficiency of the load transmitted from the reinforcing bar to the column body is reduced due to the deformation of the annular member. Can be prevented.

Moreover, since the load transmission member can be loaded only by placing the load transmission member between the annular member and the fixing end before or during the placement of the concrete forming the concrete molding, the reinforcing bar and the annular member The loading operation of the load transmitting member that transmits the load between the two can be made extremely simple.
Further, the load support body and the support structure according to the second aspect of the present invention are the connection structure between the load support body and the support body according to the first aspect, wherein the fixing end portion is a hook-like connection hook. It is preferable that it is a part or a bowl-shaped head part.

The load support and support structure according to the third aspect of the present invention is the connection structure between the load support and support structure of the first aspect or the second aspect. It is preferable that at least two members are arranged on the outer peripheral side of the support body, and a pair of the annular members is arranged so as to sandwich the reinforcing bar provided with the fixing end portion.
In such a joint structure between the load support body and the support body, the load transmitting member is connected to the reinforcing bar sandwiched between the pair of annular members, and is interposed between the fixing end portion and the pair of annular members. As a result, the load (compressive load or tensile load) from the reinforcing bars is distributed approximately evenly to the pair of annular members via the concrete layer and the load transmission member interposed between the fixing end and the pair of annular members. And can be transmitted to the column body via a pair of annular members.

  At this time, if the projected area for the pair of annular members of the load transmitting member along the transmission direction of the load transmitted from the reinforcing bar is larger than the projected area for the pair of annular members of the reinforcing bar, such a load transmitting member is Compared with the case where the reinforcing bar is joined to the annular member without using it, the load from the reinforcing bar can be evenly distributed and transmitted to the 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.

  Moreover, the joint structure of the load support body and the column body according to the fourth 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 third aspect. In the structure, the annular member is a base ring part formed in an annular shape by a steel material, and a rib-like diaphragm part is preferably joined to at least one of the inner peripheral surface and the outer peripheral surface of the base ring part. .

  According to a fifth aspect of the present invention, there is provided a joint structure between the load support body and the column body. In the joint structure between the load support body and the column body according to the fourth aspect, the fixing end portion is a hook-shaped connection hook. The diaphragm portion is joined to the inner peripheral surface of the base ring portion, and an insertion hole penetrating in the axial direction is formed in a portion corresponding to the connecting hook portion in the diaphragm portion. The load transmitting member is disposed inside the connecting hook portion so as to be inserted through the inner peripheral side of the base ring portion and through the insertion holes in the diaphragm portion. preferable.

Moreover, the joint structure of the load support body and the column body according to the sixth aspect of the present invention is the joint of the load support body and the column body according to any one of the second aspect to the fifth aspect. In the structure, the fixing end portion is a hook-shaped connecting hook portion, and the load transmitting member is formed in a U-shaped curved shape and is disposed so as to straddle the annular member from above. Is preferred.
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 second aspect to the fifth aspect. In the structure, the fixing end portion is a hook-shaped head portion, and the load transmission member is formed in a U shape or a C shape in cross section, and is inserted into an outer peripheral side of the reinforcing bar to It is preferable to be connected to a reinforcing bar.

Moreover, the joining structure of the load support body and the column body according to the eighth aspect of the present invention is the junction of the load support body and the column body according to any one of the first aspect to the seventh aspect. In the structure, a plurality of rod-shaped reinforcing steel materials are arranged on the inner peripheral side of the annular member, and each of the reinforcing steel materials is arranged so that both end portions thereof are in contact with the inner peripheral surface of the annular member. preferable.
Moreover, the joint structure of the load support body and the column body according to the ninth aspect of the present invention is the joint of the load support body and the column body according to any one of the second aspect to the eighth aspect. In the structure, the fixing end portion is a hook-like connecting hook portion provided on at least two of the plurality of reinforcing bars, and the annular member is in the axial direction of the column body inside the load support body The load transmitting member is disposed inside the connecting hook portion of one of the pair of reinforcing bars. Preferably, the annular member is disposed so as to be inserted through the inner peripheral side of the annular member and the inside of the connecting hook portion of the other reinforcing bar of the pair of reinforcing bars.

  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 reinforcing bar through the load transmitting member is distributed over a wide area of the annular member, and the annular member is deformed. 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 junction part 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 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 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 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 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 drawing which show the structure of the modification of the joint ring used for the joining structure which concerns on the 1st Embodiment of this invention. It is the top view and sectional drawing which show the structure of the modification of the joint ring used for the joining structure which concerns on the 1st Embodiment of this 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 top view and sectional drawing which show the structure of the modification of the joint ring used for the joining structure which concerns on the 2nd Embodiment of this invention. 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)
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 A plurality of steel pipe columns 16, each of which is a column body connecting the elevated beam 12 and the underground beam 14, are provided.

  The elevated beam 12 includes a concrete molded product 18 formed in a thick plate shape or a prismatic shape, a plurality of lower main reinforcing bars 21 embedded in the lower surface side of the concrete molded product 18, and the concrete molded product 18. A plurality of upper main reinforcing bars 22 embedded in the upper surface side are provided. 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). The lower main reinforcing bar 21 and the upper main reinforcing bar 22 are configured by combining them in a two-dimensional or three-dimensional (two-dimensional in the present embodiment) lattice pattern.

  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 in combination in a two-dimensional or three-dimensional (two-dimensional in the present embodiment) lattice pattern. The lower main reinforcing bar 21 and the upper main reinforcing bar 22 constitute the “rebar” defined in claim 1.

  The outer circumference of the steel pipe column 16 is formed by a steel pipe 24 having a circular cross section, and concrete is filled inside the steel pipe 24. The concrete 26 in the steel pipe 24 can be omitted depending on the bending rigidity or strength required for the steel pipe column 16. The center axis CP of the steel pipe column 16 substantially coincides with the height direction, and the lower end side thereof penetrates the underground beam 14 so that the lower end surface protrudes downward (under the ground). Further, the upper end side of the steel pipe column 16 is embedded in the elevated beam 12, and the upper end surface is located immediately below the upper main reinforcing bar 22.

  The lower main reinforcement 21 and the upper main reinforcement 22 in the underground beam 14 extend from the outer peripheral side of the steel pipe column 16 toward the outer peripheral surface 17 of the steel pipe column 16, and the extension line intersects with the outer peripheral surface 17. And the extension line does not intersect with the outer peripheral surface 17. In FIG. 1, 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 outer peripheral surface 17 are shown. The lower main reinforcing bar 21 in the elevated beam 12 also extends from the outer peripheral side of the steel pipe column 16 toward the outer peripheral surface 17 of the steel pipe column 16, and the extension line intersects the outer peripheral surface 17, and the extension line is the outer periphery. Some do not intersect the surface 17.

In FIG. 1, only the lower main reinforcing bar 21 in the elevated beam 12 where the extension line intersects the outer peripheral surface 17 is shown. Moreover, since the upper main reinforcing bar 22 is located above the steel pipe column 16, it does not intersect with the steel pipe column 16.
As described above, the lower main reinforcing bar 21 and the upper main reinforcing bar 22 that intersect with the steel pipe column 16 (hereinafter collectively referred to as “intersecting main reinforcing bar 20”) are shown in FIG. As described above, a hook-like connecting hook portion 28 is formed as a fixing end portion that is bent in a U shape at the tip end portion and is turned back to the outer peripheral side of the steel pipe column 16.

  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 steel pipe column 16 are such that the tip of each connecting hook portion 28 is a bridge. A plurality of (two in this embodiment) intersecting main reinforcing bars 20 that are in the same position along the width direction and on the other side in the bridge width direction across the steel pipe column 16 are also connected to the connecting hook portion 28. The tips are at the same position along the bridge width direction.

  Similarly, among the intersecting main reinforcing bars 20, a plurality of (in this embodiment, two) intersecting main reinforcing bars 20 on one side in the bridge axis direction across the steel pipe column 16 have the end of the connecting hook portion 28. A plurality of (two in this embodiment) intersecting main reinforcing bars 20 that are in the same position along the bridge axis direction and on the other side in the bridge axis direction across the steel pipe column 16 are also connected to the connecting hook portion 28. The tips are in the same position along the bridge axis direction. These intersecting main reinforcing bars 20 are such that the tips of the connecting hook portions 28 are separated from the outer peripheral surface 17 of the steel pipe column 16, and the distances from the central axis CP of the steel pipe columns 16 to the tips of the connecting hook portions 28 are substantially constant. It is a thing.

  In the ramen 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 steel pipe column 16 by the joining structure 30. 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 bar 20 and the steel pipe column 16 are mechanically connected so that they can be transmitted to the steel pipe column 16 and can be transmitted to other cross main reinforcing bars 20 via the steel pipe column 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 that are annular members 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). ing. 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. A circular opening 40 is formed in the diaphragm portion 38 on the center side, and the inner diameter of the circular opening 40 is slightly larger than the outer diameter of the steel pipe column 16. 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 (arranged) on the outer peripheral side of the steel pipe column 16 inside the elevated beam 12 and the underground beam 14 which are load supports, and the concrete molding 18 Embedded with a part of the steel pipe column 16. Specifically, two pairs of joint rings 32 and 34 are arranged inside the underground beam 14 with respect to one steel pipe column 16, and one steel pipe column 16 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. 1, the pair of joint rings 32, 34 arranged on the lower surface side in the underground beam 14 has a lower main reinforcing bar 21 (crossed main reinforcing bar 20 between the base ring portions 36. ). 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 into the outer peripheral side of the steel pipe column 16, and are arranged so as to sandwich the cross main reinforcing bar 20 between the base ring parts 36, thereby the steel pipe column 16 and the cross main reinforcing bar 20. Is completely loaded.

  A gap having a width corresponding to the outer diameter of the intersecting main reinforcing bar 20 is formed between the pair of base rings 36 in the pair of joint rings 32 and 34 embedded in the underground beam 14 and the elevated beam 12. Further, the pair of joint rings 32 and 34 are inclined with respect to the height direction (the axial direction of the steel pipe column 16) by sandwiching the intersecting main reinforcing bars 20 directly or through a thin concrete layer between the base ring portions 36. It is supported not to occur. 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 steel pipe 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 outer peripheral surface 17 of the steel pipe column 16.

  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 steel pipe column 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 of the elevated beam 12 near the side end along the bridge width direction. As shown in FIG. 5A, in the vicinity of the end portion of the elevated beam 12 along the bridge width direction, 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 as load transmission members that are respectively loaded into 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. That is, the pair of load transmission rods 44 are disposed between the joint rings 32 and 34 as the annular members and the connecting hook portion 28 as the fixing end portion. 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 steel pipe 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 steel pipe 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 bars 20 sandwiched between the pair of joint rings 32, 34 and the load transmission rod 44 are arranged on the outer peripheral side of the steel pipe column 16, respectively. At the same time, it is embedded in the concrete molding 18. Thereby, since the cross main rebar 20 is joined to the steel pipe column 16 by the joining structure 30, when a load is transmitted from the outside to the arbitrary cross main rebar 20 or internal stress acts on the cross main rebar 20, A part of the transmitted load (compressive load or tensile load) is a steel pipe through a load transmitting rod 44, a pair of joint rings 32, 34, and a concrete layer 48 (see FIG. 4B) interposed therebetween. It is transmitted to the pillar 16. At this time, the sum of the projected areas of the two load transmission rods 44 along the transmission direction (= rebar axis direction) of the load transmitted from the intersecting main reinforcing bar 20 with respect to the pair of joint rings 32 and 34 is one intersection. The projected area of the main reinforcing bar 20 with respect to the pair of joint rings 32 and 34 is larger.

  In addition, when the cross main reinforcing bar 20 that has transmitted the load to the steel pipe column 16 is disposed on the elevated beam 12, the load transmitted from the cross main reinforcing bar 20 to the steel pipe column 16 is grounded through the steel pipe column 16. It is transmitted to a plurality of intersecting main reinforcing bars 20 around the steel pipe column 16 in the intermediate beam 14. On the contrary, when the cross main reinforcing bar 20 that has transmitted the load to the steel pipe column 16 is disposed on the underground beam 14, the load transmitted from the cross main reinforcing bar 20 to the steel pipe column 16 is the steel pipe column. 16 is transmitted to a plurality of intersecting main reinforcing bars 20 around the steel pipe column 16 in the elevated beam 12. 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 bending 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 the bending moment shown in FIG. 6 acts on the ramen viaduct 10, bending deformation along the bridge width direction occurs in the elevated beam 12. 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 R <b> 2 of the upper main reinforcing bar 22 is supported by the compression resistance of the concrete molding 18 and is transmitted to the steel pipe column 16 through the concrete molding 18 as the concrete support pressure CU. The concrete support pressure CU gradually decreases in size from the upper main reinforcing bar 22 toward the neutral plane NF along the axial direction of the steel pipe 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 and 34 on the opposite side of the lower main reinforcing bar 21, and is transmitted to the steel pipe column 16 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, the construction method of the ramen viaduct 10 to which the joining structure 30 according to the present embodiment is applied will be described with reference to FIGS. When joining the intersecting main reinforcing bars 20 to the steel pipe columns 16 by the joining structure 30, first, as shown in FIG. 7, the intersecting main reinforcing bars 20 on the outer peripheral side of the steel pipe columns 16 (the lower main reinforcing bars 21 in FIG. 7). The joint ring 34 is inserted into a portion corresponding to, and positioned so that the center of the joint ring 34 coincides with the central axis CP of the steel pipe column 16, and then the joint ring 34 is temporarily fixed to the steel pipe column 16. At this time. The joint ring 34 is fixed to the steel pipe column 16 by being connected by a working scaffold assembled around the steel pipe column 16 via a bracket or the like, for example.

  Next, as shown in FIG. 8, a plurality of reinforcing bars are arranged so as to extend along the bridge width direction and the bridge axis direction along a horizontal plane having a predetermined height from the ground surface G. The lower main reinforcing bar 21 is assembled in a two-dimensional lattice shape by the reinforcing bar material. Among these lower main reinforcing bars 21, the crossed main reinforcing bars 20 extending from the outer peripheral side of the steel pipe column 16 to the vicinity of the outer peripheral surface are connected in a U-shape to the tip as shown in FIG. What formed the hook part 28 is used. 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 the assembly of the lower main reinforcing bar 21 is completed, as shown in FIG. 9, the upper joint ring 32 is inserted into the outer peripheral side of the steel pipe column 16 from the upper end side, and this joint ring 32 is mounted on the intersecting main reinforcing bar 20. And positioning 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 of the steel pipe column 16. 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 32, the inside of the connecting hook portion 28, and the insertion hole 46 of the joint ring 34. 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 bridged in the bridge width direction and the bridge axis direction along a horizontal plane having a predetermined height from the ground surface G. The upper main reinforcing bars 22 are assembled in a two-dimensional lattice shape with these reinforcing bars.

  Finally, a casing-shaped concrete frame (not shown) whose upper surface is opened is installed so as to surround the steel pipe column 16, the lower main reinforcing bar 21, and the upper main reinforcing bar 22, and uncured concrete material is provided in the concrete frame. The concrete material 18 is cured to form the concrete molding 18, thereby completing the construction of the elevated beam 12. Note that the concrete frame is dismantled and used, for example, for the construction of another elevated beam 12. Moreover, since the underground beam 14 is built by the same construction method as that of the elevated beam 12, description of the construction method is omitted.

(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 load transmission rod 44 as a load transmission member is disposed on the outer peripheral side of the steel pipe column 16 that is a column body inside the underground beam 14 and the elevated beam 12 as load supports. The joint rings 32 and 34 as the annular members and the connecting main reinforcing bars 20 that intersect the steel pipe column 16 are connected as fixing ends located between the joint rings 32 and 34 and the outer peripheral surface of the steel pipe column 16. By being disposed between the hook portions 28, the load (compressive load or tensile load) from the cross main reinforcing bars 20 is applied to the concrete layer 48 and the load interposed between the connecting hook portion 28 and the joint rings 32 and 34. It can be transmitted to the joint rings 32, 34 via the transmission rod 44 and can be transmitted to the steel pipe column 16 via the joint rings 32, 34.

  At this time, the sum of the projected areas of the load transmission rod 44 on the joint rings 32 and 34 along the transmission direction of the load transmitted from the tolerance main reinforcing bar 20 is the projection of the single tolerance main reinforcing bar 20 on the joint rings 32 and 34. Since it is larger than the area, the load from the tolerance main reinforcing bar 20 is compared with the case where the tolerance main reinforcing bar 20 is joined to the joint rings 32, 34 without using such a load transmission rod 44. In addition, the joint rings 32 and 34 can be transmitted evenly distributed over a wide area of the joint rings 32 and 34 via the load transmission rod 44, so that it is effective that the joint rings 32 and 34 are locally deformed by the transmission load from the tolerance main reinforcing bar 20. Can be prevented.

  That is, the straight rod-shaped load transmission rod 44 is inserted inside the connecting hook portion 28 of the crossed main reinforcing bar 20 sandwiched between the pair of joint rings 32 and 34 and through the inner peripheral side of the pair of base ring portions 36. By arranging in this manner, the load (compressive load or tensile load) from the crossed main reinforcing bars 20 is distributed substantially uniformly and transmitted to the pair of joint rings 32 and 34 via the concrete layer 48 and the load transmission rod 44. And can be transmitted to the steel pipe column 16 through the pair of joint rings 32 and 34.

  At this time, the sum of the projected areas of the pair of joint rings 32 and 34 of the load transmission rod 44 along the transmission direction of the load transmitted from the intersecting main reinforcing bar 20 is a pair of joint rings 32 of one intersecting main reinforcing bar 20. 34, the cross main rebar 20 is directly joined to the joint ring without using such a load transmission rod 44, and the load from the cross main rebar 20 is compared with the concrete. Since it can transmit evenly distributed over the wide area | region of a pair of joint rings 32 and 34 via the layer 48 and the load transmission rod 44, a pair of joint rings 32 and 34 are locally transmitted with the transmission load from the cross main reinforcing bar 20. Deformation can be effectively prevented.

As a result, according to the joint structure 30 according to the present embodiment, the pair of joint rings 32 and 34 can be effectively prevented from being locally deformed by the transmission load from the crossed main reinforcing bars 20. It can also be effectively prevented that the transmission efficiency of the load transmitted from the intersecting main reinforcing bar 20 to the steel pipe column 16 is reduced due to the deformation of 34.
Further, in the joint structure 30, before or during the placement of the concrete forming the concrete molded product, the load transmission rod 44 as the load transmission member is connected to the joint rings 32 and 34 as the annular member and the connecting hook as the fixing end. Since the load transmission rod 44 can be loaded simply by placing it between the portion 28, the loading operation of the load transmission rod 44 for transmitting the load between the tolerance main reinforcing bar 20 and the joint rings 32, 34 is extremely simple. Can be.

  That is, before placing the concrete, the load transmission rod 44 is placed inside the connecting hook portion 28 of the crossed main reinforcing bar 20 so as to pass through the inner peripheral side of the pair of base ring portions 36. Since the transmission rod 44 can be loaded into the connecting hook portion 28 of the crossing main reinforcing bar 20, the loading operation of the load transmission rod 44 that transmits the load between the crossing main reinforcing bar 20 and the pair of joint rings 32 and 34 is extremely simple. Can be.

  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 modification of the load transmission rod 50 used in the joint structure 30 according to the present embodiment will be described. FIG. 11 shows a configuration when a modification of the load transmission rod is used in the joint structure according to the present embodiment. As shown in FIG. 11B, the load transmission rod 50 is formed by bending 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. 52 is arranged on the outer peripheral side of the pair of joint rings 32 and 34. Further, when the straight rod portion 52 is inserted through the insertion holes 46 of the pair of upper and lower joint rings 34, the straight rod portions 52 and 54 are paired so that the longitudinal direction thereof substantially coincides with the axial direction of the steel pipe column 16. Supported by joint rings 32 and 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 modified example of the joint ring used in the joint structure 30 according to the present embodiment will be described. 12 and 13 each show a modification of the joint ring in the joint structure 30 according to the present embodiment.
The joint ring 60 shown in FIG. 12 is formed in an annular shape in plan view, and is disposed on the inner peripheral side of the base ring portion 62 formed of a steel material having a substantially rectangular cross section. A plurality of reinforcing reinforcing bars (reinforcing steel materials) 64 are provided. The reinforcing reinforcing bars 64 are formed by cutting a straight bar-shaped reinforcing bar material into a predetermined length. The plurality of reinforcing reinforcing bars 64 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 reinforcing reinforcing bars 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. 12B, the reinforcing reinforcing bars 64 are respectively arranged on the upper end side and the lower end side on the inner peripheral side of the base ring part 62, and are arranged on the upper end side and the lower end side of the base ring part 62. The pair of reinforcing reinforcing bars 64 are arranged at the same position in plan view. In the present embodiment, four pairs of reinforcing reinforcing bars 64 are arranged on the inner peripheral side of the base ring portion 62. Both end portions of the pair of reinforcing reinforcing bars 64 are in contact with both end portions of arc portions 62A to 62D obtained by dividing the base ring portion 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 made into a pair and is inserted into the outer peripheral side of the steel pipe column 16, and the cross main reinforcing bars 20 are interposed between the pair of base ring portions 62. Pinch. 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 reinforcing reinforcing bar 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 reinforcing reinforcing bar 64. Thereby, a part of the transmission load from the intersecting main reinforcing bars 20 is transmitted to the joint ring 60 through the concrete layer and the reinforcing reinforcing bars 64, and the remaining part is directly transmitted to the pair of joint rings 60. .

  In the joint ring 60 shown in FIG. 12, a plurality of reinforcing bars 64 (eight in this embodiment) are arranged on the inner peripheral side of the base ring part 62, and these reinforcing bars 64 are connected to each arc part at both ends. When the load is transmitted from the cross main reinforcing bar 20 by abutting both ends of 62A to 62D, the transmission load is distributed and transmitted to the wide range of the base ring part 62 by the reinforcing reinforcing bar 64, and Since a part of the transmission load is also supported by the reinforcing bars 64 on the inner peripheral side of the base ring part 36, the transmission from the cross main reinforcing bars 20 is compared with the case where the joint ring 60 is composed of only the base ring part 62. It is possible to effectively prevent the pair of joint rings 32 and 34 from being locally deformed by the load.

  Next, the joint ring 70 shown in FIG. 13 will be described. The joint ring 70 is different from the joint ring 60 shown in FIG. 12 in that a rib-like diaphragm portion 72 is disposed between a pair of reinforcing bars 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.

  In the joint 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. Further, without making the insertion hole 46, the load transmission rod 44 or the straight rod portion 52 of the load transmission rod 50 is inserted through the inside of the connecting hook portion 28 of the main reinforcing bar 20 and the inner peripheral side of the diaphragm portion 72, respectively. Also good.

  In the joint ring 70 shown in FIG. 13, a plurality of reinforcing bars 64 (eight in this embodiment) are disposed on the inner peripheral side of the base ring portion 62, and the diaphragm portion 72 is disposed inside the base ring portion 62. As a result of joining to the peripheral surface by welding or the like, the bending rigidity of the joint ring 70 with respect to the load transmitted from the crossing main reinforcing bar 20 compared to the joint rings 32 and 34 shown in FIG. 3 and the joint ring 60 shown in FIG. Therefore, it is possible to more effectively prevent the pair of joint rings 70 from being locally deformed by the transmission load from the intersecting main reinforcing bars 20.

[Second Embodiment]
(Composition structure)
FIG. 14 shows the configuration of the joint structure according to the second embodiment of the present invention. This joining structure 80 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 80 according to the present embodiment, the same portions 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 80 according to the present embodiment is similar to the joint structure 30 according to the first embodiment in that the cross main reinforcing bars 20 arranged in the elevated beam 12 and the underground beam 14 in the ramen viaduct 10 are steel pipes. It is joined to the column 16.
However, in the ramen viaduct 10 shown in FIG. 1, the connecting hook portion 28 curved in a U shape is formed at the distal end portion of the intersecting main reinforcing bar 20, but the joining structure 80 according to the present embodiment is applied. As shown in FIG. 14C, a hook-shaped head portion 82 as a fixing end portion is formed at the distal end portion of the intersecting main reinforcing bar 20 in place of the connecting hook portion 28.

The head portion 82 is formed in a disk shape having an outer diameter about three times the outer diameter of the reinforcing bar portion 94 of the intersecting main reinforcing bar 20, and is arranged coaxially with the reinforcing bar portion 94. Such a head portion 82 can be formed integrally with the crossing main reinforcing bar 20 and can be fixed to the tip of the crossing main reinforcing bar 20 by welding or the like.
As shown in FIG. 14B, the joint structure 80 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 84 and 86 are provided as annular members. The joint ring 84 and the joint ring 86 have basically the same shape, and are configured only by the base ring portion 36 (see FIG. 3) formed in a rectangular shape in plan view.

  The pair of joint rings 84 and 86 are respectively fitted and inserted on the outer peripheral side of the steel pipe column 16 and embedded in the concrete molded product 18 together with a part of the steel pipe column 16. At this time, the pair of joint rings 84 and 86 arranged on the lower surface side in the underground beam 14 sandwich the tip side of the lower main reinforcing bar 21 (crossed main reinforcing bar 20). Moreover, a pair of joint rings 84 and 86 arrange | positioned at the upper surface side in the underground beam 14 clamp the front end side of the upper main reinforcement 22 (crossing main reinforcement 20).

  On the other hand, the pair of joint rings 84 and 86 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 84 and 86 are fitted and inserted into the outer peripheral side of the steel pipe column 16 and the loading of the steel pipe column 16 and the cross main reinforcing bar 20 is completed by sandwiching the cross main reinforcing bar 20. At this time, the joint rings 84 and 86 are positioned so that the center (center of gravity) of the base ring portion 36 in the horizontal cross section substantially coincides with the center axis CP of the steel pipe column 16.

  As shown in FIG. 14C, the joint structure 80 includes a load transmission spacer 88 as a load transmission member loaded in the intersecting main reinforcing bar 20. Here, the load transmission spacer 88 is formed of a substantially circular iron plate material. The load transmission spacer 88 is formed with a fitting insertion groove 90 extending from one end of the outer peripheral surface to the other end along the radial direction. The fitting groove 90 is formed with a semicircular R-shaped curved surface 92 at the tip opposite to the opening end, and the opening width of the portion excluding the curved surface 92 is that of the reinforcing bar portion 94. It is slightly larger than the outer diameter.

  Here, as shown in FIG. 14B, when the distance D from the upper end surface to the lower end surface of the pair of joint rings 84 and 86 sandwiching the intersecting main reinforcing bars 20 is set, the outer diameter of the load transmission spacer 88 is ( D × 1/2) or more. Further, the load transmission spacer 88 is loaded on the distal end side of the intersecting main reinforcing bar 20 by inserting the fitting insertion groove 90 into the outer peripheral side of the reinforcing bar portion 94. At this time, the reinforcing bar portion 94 abuts on the curved surface 92 of the fitting groove 90, and in this state, the center of the load transmission spacer 88 is substantially the reinforcing bar axis SR (see FIG. 14C) of the intersecting main reinforcing bar 20. Match.

The thickness of the load transmission spacer 88 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 88 cannot withstand the transmission load. Two or more load transmission spacers 88 may be loaded in one cross main reinforcing bar 20.
As shown in FIGS. 14A and 14B, the load transmission spacer 88 is loaded on the distal end side of the cross main reinforcing bar 20 sandwiched between the pair of joint rings 84 and 86. Specifically, the load transmission spacer 88 is a portion on the proximal end side with respect to the head portion 82 in the reinforcing bar portion 94 and is connected to a portion on the inner peripheral side of the pair of joint rings 84 and 86.

  At this time, it is preferable that the load transmission spacer 88 is separated from the head portion 82 along the reinforcing bar axis direction and is also separated from the inner peripheral surfaces of the joint rings 84 and 86. By arranging in this way, the load from the head part 82 is transmitted to a wide range of the load transmission spacer 88 through concrete (concrete layer) as compared with the case where the load transmission spacer 88 is brought into contact with the head part 82. The deformation of the load transmission spacer 88 can be suppressed. However, when a sufficient space cannot be secured between the head portions 82 along the reinforcing bar axis direction, the load transmission spacer 88 is brought into contact with the head portion 82 to prevent the concrete layer from being crushed. May be.

  In the joint structure 80, a pair of joint rings 84, 86, a tip side including the head portion 82 of the intersecting main reinforcing bar 20, and a load transmission spacer 88 are arranged on the outer peripheral side of the steel pipe column 16, and the concrete molded product together with the steel pipe column 16. 18 is embedded inside. Thereby, since the cross main reinforcement 20 is joined to the steel pipe column 16 by the joining structure 80, when a load is transmitted from the outside to the arbitrary cross main reinforcement 20 or an internal stress acts on the cross main reinforcement 20, A part of the transmitted load (compressive load or tensile load) is transmitted to the steel pipe column 16 via the load transmitting spacer 88, the pair of joint rings 84, 86, and the concrete layer interposed therebetween. At this time, the projected area of the load transmission spacer 88 along the rebar axis direction on the pair of joint rings 84 and 86 is larger than the projected area of the head portion 82 on the joint rings 84 and 86 of the cross main reinforcing bar 20.

  The timing of loading the load transmission spacer 88 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 84 and 86. Immediately after the assembly of the lower main rebar 21 or the upper main rebar 22 (cross main rebar 20) is completed, the load 86 is loaded into the cross main rebar 20 after the ring 86 is inserted into the outer peripheral side of the steel pipe column 16. Also good.

(Operation of bonding structure)
Next, the operation of the joint structure 80 according to this embodiment will be described. In the joint structure 80 according to the present embodiment, the load transmission spacer 88 as a load transmission member is disposed on the outer peripheral side of the steel pipe column 16 that is a column body inside the underground beam 14 and the elevated beam 12 as load supports. The joint ring 84, 86 as an annular member and the head as a fixing end provided between the joint rings 84, 88 and the outer peripheral surface of the steel pipe column 16 are provided in the intersecting main reinforcing bar 20 intersecting the steel pipe column 16. By being disposed between the head portion 82 and the joint ring 84, 86, a load from the intersecting main reinforcing bar 20 (compressive load or tensile load) and the load transmission spacer 88 are arranged between the head portion 82 and the joint rings 84, 86. Can be transmitted to the joint rings 34 and 86, and can be transmitted to the steel pipe column 16 via the joint rings 84 and 86.

  That is, the load transmission spacer 88 is connected to a portion (reinforcing bar portion 94) between the head portion 82 and the pair of joint rings 84 and 86 in the crossing main reinforcing bar 20, thereby causing a load (compressive load) from the crossing main reinforcing bar 20 to be present. (Or tensile load) can be distributed to the pair of joint rings 84 and 86 through the concrete layer and the load transmission spacer 88 in a substantially uniform manner, and can be transmitted to the steel pipe column 16 through the pair of joint rings 84 and 86. .

  At this time, the projected area with respect to the pair of joint rings 84 and 86 of the load transmission spacer 88 along the reinforcing bar axis direction is larger than the projected area with respect to the joint rings 84 and 86 of the head portion 82 of the intersecting main reinforcing bar 20. Thus, the load from the crossed main reinforcing bars 20 can be evenly distributed and transmitted to the pair of joint rings 84 and 86 through the concrete layer and the load transmission spacer 88 and wide along the circumferential direction of each joint ring 84 and 86. Since it can transmit evenly disperse | distributing to a area | region, it can prevent effectively that a pair of joint rings 84 and 86 deform | transform locally by the transmission load from the cross main reinforcing bar 20. FIG.

As a result, according to the joint structure 80 according to the present embodiment, it is possible to effectively prevent the pair of joint rings 84 and 86 from being locally deformed by the transmission load from the intersecting main reinforcing bars 20. With the deformation of 86, it is possible to effectively prevent the transmission efficiency of the load transmitted from the crossed main reinforcing bar 20 to the steel pipe column 16 from being lowered.
In addition, in the joint structure 30, the load transmission spacer 88 can be loaded into the cross main reinforcing bar 20 by simply inserting the load transmitting spacer 88 into the reinforcing bar portion 94 of the cross main reinforcing bar 20 from above before placing concrete. Thus, the load transmission spacer 88 does not fall off, so the loading operation of the load transmission spacer 88 for transmitting the load between the crossed main reinforcing bar 20 and the pair of joint rings 84 and 86 can be made extremely simple.

(Modification of joint ring)
Next, a modification of the joint ring used in the joint structure 80 according to the present embodiment will be described. FIG. 15 shows a modification of the joint ring in the joint structure 30 according to this embodiment.
The joint ring 100 shown in FIG. 15 includes a plurality of diaphragm portions 102 disposed on the outer peripheral side of the base ring portion 36. The diaphragm portion 102 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 102 is formed in an arc shape with an outer peripheral end having a constant radius of curvature and a linear shape extending along the chord direction with respect to the arc-shaped outer peripheral end in plan view. Is formed. Diaphragm portion 102 has the entire inner peripheral end surface joined to the outer peripheral surfaces of side portions 36A to 36D.

  Similarly to the joint rings 84 and 86, the joint ring 100 shown in FIG. 15 is also made into a pair and is inserted into the outer peripheral side of the steel pipe column 16, and the cross main reinforcing bars 20 are interposed between the pair of base ring portions 36. Hold the tip side of. In this state, the load transmission spacer 88 is inserted into the portion (reinforcing bar portion 94) between the head portion 82 and the pair of joint rings 100 in the crossed main reinforcing bar 20 from above and connected. Thereby, the load from the intersecting main reinforcing bars 20 can be transmitted to the pair of joint rings 100 via the concrete layer and the load transmission spacer 88.

  In the joint ring 100 shown in FIG. 15, when the diaphragm portion 102 is joined to the outer peripheral surfaces of the side portions 36 </ b> A to 36 </ b> D in the base ring portion 36, the joint ring 100 is configured by only the base ring portion 62. As compared with the above, since the bending rigidity along the circumferential direction of the joint ring 100 with respect to the load transmitted from the intersecting main reinforcing bar 20 can be greatly increased, the pair of joint rings 100 are locally formed by the transmitted load from the intersecting main reinforcing bar 20. Deformation can be effectively prevented.

  Moreover, in the joint ring 100, each diaphragm part 102 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 102 in a substantially crescent shape, the bending rigidity of the joint ring 100 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 100 can be efficiently increased using the portion 102).

  It is possible to increase the bending rigidity of the joint ring 100 by joining a diaphragm portion 38 (see FIG. 3) to the inner peripheral surface of the base ring portion 36. In order to avoid interference, it is necessary to reduce the width of the diaphragm portion 38 or to form an opening or a notch in a portion of the diaphragm portion 38 facing the load transmission spacer 88 to avoid interference with the load transmission spacer 88. is there.

  Further, in the joint structure 80 according to the present embodiment, the joint ring 60 shown in FIG. 12 can be used as the annular member. Also in this case, a pair of joint rings 60 are inserted into the outer peripheral side of the steel pipe column 16, and the cross main reinforcing bars 20 are sandwiched between the pair of base ring portions 62. At this time, the head portion 82 in the intersecting main reinforcing bar 20 is inserted to the inner peripheral side of the reinforcing reinforcing bar 64. In this state, the load transmission spacer 88 is inserted and connected to a portion (reinforcing bar portion 94) between the head portion 82 and the reinforcing reinforcing bar 64 in the cross main reinforcing bar 20 from above. Thereby, the transmission load from the crossed main reinforcing bars 20 can be transmitted to the joint ring 60 via the concrete layer and the load transmission spacer 88.

  Therefore, also in the joint structure 80 according to the present embodiment, by using the joint ring 60 as the annular member, the transmission load is distributed over a wide range of the base ring portion 62 by the reinforcing reinforcing bars 64 when the load is transmitted from the cross main reinforcing bars 20. Since a part of the transmission load is also supported by the reinforcing bars 64 on the inner peripheral side of the base ring portion 36, the pair of joint rings 60 are locally deformed by the transmission load from the cross main reinforcing bars 20. Can be effectively prevented.

In the joint structure 80 according to the present embodiment, a substantially disc-shaped load transmission spacer 88 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 94 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 82.
In addition, when using a joint ring in which the base ring part is curved with a constant radius of curvature, the load transmission spacer is used to adjust the radius of curvature of the base ring part in order to level the load transmitted to the joint ring. You may use what curved by the corresponding curvature radius.

[Third embodiment]
(Composition structure)
FIG. 16 shows the configuration of the joint structure according to the third embodiment of the present invention. This joining structure 110 is applicable to the ramen viaduct 10 instead of the joining structure 30 according to the first embodiment. Note that in the joint structure 110 according to the present embodiment, the same portions 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 110 according to the present embodiment is similar to the joint structure 30 according to the first embodiment in that the cross main reinforcing bars 20 arranged in the elevated beam 12 and the underground beam 14 in the ramen viaduct 10 are connected to the steel pipe columns 16. To be joined.

  However, in the joining 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 steel pipe column 16, but this embodiment The joint structure 110 according to the present embodiment is different from the joint structure 30 according to the first embodiment in that only one joint ring 112 is used to join the plurality of intersecting main reinforcing bars 20 to the steel pipe column 16. .

  A joint structure 110 shown in FIG. 16A includes a joint ring 112 as an annular member 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 112 includes only a base ring portion 36 (see FIG. 3) formed in a rectangular shape in plan view. The joint ring 112 is fitted on the outer peripheral side of the steel pipe column 16 and is embedded in the concrete molded product 18 together with a part of the steel pipe column 16. At this time, the joint ring 112 abuts on the front end side of the intersecting main reinforcing bar 20 from below and supports the front end side of the intersecting main reinforcing bar 20 from below. The joint ring 112 is positioned so that the center (center of gravity) of the base ring portion 36 in the horizontal cross section substantially coincides with the center axis CP of the steel pipe column 16.

  A connecting hook portion 28 as a fixing end portion curved in a U-shape is formed at the front end portion of the intersecting main reinforcing bar 20, and this connecting hook portion 28 is in a state of engaging the joint ring 112 (hanging state). It has become. Here, the latching state means that the rebar material forming the connecting hook portion 28 is wound around the outer peripheral side of the steel rod on which the joint ring 112 (base ring portion 36) is formed by a half or more. As a result, the movement of the connecting hook portion 28 toward the outer peripheral side is restrained, so that it is effective that the connecting hook portion 28 falls off the joint ring 112 even when an excessive tensile load acts on the cross main reinforcing bars 20. Can be prevented.

The distal end of the connecting hook portion 28 is inserted to the inner peripheral side of the joint ring 112. As a result, a gap is formed between the inner peripheral surface of the joint ring 112 and the inner peripheral end of the connecting hook portion 28. Further, as shown in FIG. 16B, 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 110 includes a straight rod-shaped load transmission rod 44 that is loaded into the connection hook portion 28 of the crossed 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 112. At this time, as shown in FIG. 16B, the load transmission rod 44 obliquely crosses the side portions 36 </ b> A to 36 </ b> D (side portion 36 </ b> A in FIG. 16) of the joint ring 112 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 steel pipe column 16 is θ, the inclination angle θ is preferably set to an angle close to 90 °.

  In the joint structure 110, the load transmission rod 44 and the connection hook part 28 and the connection hook part 28 and the joint ring 112 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 110, the joint ring 112, the distal end side including the connecting hook portion 28 of the intersecting main reinforcing bar 20, and the load transmission rod 44 are respectively arranged on the outer peripheral side of the steel pipe column 16. Buried in Thereby, since the cross main reinforcement 20 is joined to the steel pipe column 16 by the joining structure 110, when a load is transmitted from the outside to the arbitrary cross main reinforcement 20 or an internal stress acts on the cross main reinforcement 20, A part of the transmitted load (compressive load or tensile load) is transmitted to the steel pipe column 16 through the load transmitting rod 44, the joint ring 112, and the concrete layer interposed therebetween. At this time, the projected area of the connecting hook part 28 and the load transmitting rod 44 along the reinforcing bar axis direction on the joint ring 112 is naturally larger than the projected area of the connecting hook part 28 on the intersecting main reinforcing bar 20 on the joint ring 112.

(Operation of bonding structure)
Next, the operation of the bonding structure 110 according to this embodiment will be described. In the joint structure 110 according to the present embodiment, the projected area of the connecting hook portion 28 and the load transmitting rod 44 along the reinforcing bar axial direction with respect to the joint ring 112 is the projected area of the connecting hook portion 28 of the intersecting main reinforcing bar 20 with respect to the joint ring 112. Therefore, compared with the case where the cross main reinforcing bar 20 is connected to the joint ring 112 only by hooking the joint ring 112 by the connecting hook portion 28, the load from the cross main reinforcing bar 20 is reduced to the joint ring. Since it can disperse | distribute and transmit to a wide area | region along the circumferential direction of 112, it can prevent effectively that the joint ring 112 deform | transforms locally by the transmission load from the cross main reinforcing bar 20. FIG.

As a result, according to the joint structure 110 according to the present embodiment, the joint ring 112 can be effectively prevented from being locally deformed by the transmission load from the intersecting main reinforcing bars 20, so that the joint ring 112 is deformed. It can also be effectively prevented that the transmission efficiency of the load transmitted from the cross main reinforcing bar 20 to the steel pipe column 16 is lowered.
Further, in the joint structure 110, 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 112 can be made extremely simple.

Further, in the joint structure 110 according to the present embodiment, in addition to the joint ring 112 shown in FIG. 16 as the annular member, the joint ring 112 shown in FIG. 15 can be used. It is possible to further effectively prevent the pair of joint rings 112 from being locally deformed by the transmission load from the main reinforcing bar 20.
It is possible to increase the bending rigidity of the joint ring 112 by joining a diaphragm portion 38 (see FIG. 3) to the inner peripheral surface of the base ring portion 36. In this case, the load transmission rod 44 and In order to avoid interference with the connecting hook portion 28, the width of the diaphragm portion 38 is narrowed, or an opening or a notch portion is formed in a portion of the diaphragm portion 38 facing the connecting hook portion 28. It is necessary to avoid interference.

  In the joint structure 110 according to the present embodiment, the joint ring 60 shown in FIG. 12 can be used as the annular member. In this case, the joint ring 112 and the intersecting main reinforcing bar 20 are hooked by the connecting hook portion 28 of the intersecting main reinforcing bar 20, and the load transmission rod 44 is located inside the connecting hook portion 28 and the inner periphery of the intersecting main reinforcing bar 20. Plugged into the side. As a result, when the load is transmitted from the intersecting main reinforcing bars 20, the transmitted load is distributed and transmitted to the wide range of the base ring part 62 by the reinforcing reinforcing bars 64, and part of the transmitted load is on the inner peripheral side of the base ring part 36. Therefore, the joint ring 60 can be effectively prevented from being locally deformed by the transmission load from the intersecting main reinforcing bar 20.

  In the joint structure 110 according to the present embodiment, only one load transmission rod 44 is loaded in 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 110, a load transmitting rod 56 (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 ring 112 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 112. 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.

[Fourth Embodiment]
(Composition structure)
FIG. 17 shows the structure of the joint structure according to the fourth embodiment of the present invention. These joining structures 120 are applicable to the ramen viaduct 10 instead of the joining structure 30 according to the first embodiment. Note that in the joint structure 120 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 120 according to the present embodiment joins the elevated beam 12 and the underground beam 14 in the rigid frame viaduct 10 to the steel pipe column 16 in the same manner as the joint structure 30 according to the first embodiment. That is, the joint structure 120 according to the present embodiment is similar to the joint structure 30 according to the first embodiment in that the cross main reinforcing bars 20 arranged in the elevated beam 12 and the underground beam 14 in the ramen viaduct 10 are steel pipes. It is joined to the 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 120 of this embodiment is applied, the lower main reinforcing bar 21 of the elevated beam 12, the lower main reinforcing bar 21 and the upper main reinforcing bar of the underground beam 14 are configured. 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.

  Further, 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 steel pipe column 16. The joining structure 120 is different from the joining structure 30 according to the first embodiment in that only one joint cylinder 122 is used as an annular member for joining a plurality of intersecting main reinforcing bars 20 to the steel pipe column 16. .

  The joint structure 120 according to the present embodiment includes a joint cylinder 122 interposed between a pair of upper and lower intersecting main reinforcing bars 20 arranged at different positions along the height direction (arrow HB direction) of the viaduct. Yes. The joint cylinder 122 is formed in a cylindrical shape, and is produced, 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 122 is fitted and inserted on the outer peripheral side of the steel pipe column 16, and is embedded together with a part of the steel pipe column 16 in the concrete molding 18. At this time, the joint cylinder 122 abuts the upper end surface of the joint cylinder 122 on the distal end side of the intersecting main reinforcing bar 20 positioned on the upper side in the height direction and the distal end side of the intersecting main reinforcing bar 20 positioned on the lower side. Abut. The joint cylinder 122 is positioned such that the center (center of gravity) in the horizontal cross section substantially coincides with the center axis CP of the steel pipe column 16.

  The distal end of the connecting hook portion 28 as a fixing end portion is inserted to the inner peripheral side of the joint cylinder 122. Thereby, a gap is formed between the inner peripheral surface of the joint cylinder 122 and the inner peripheral end of the connection hook portion 28. The joint structure 120 includes a load transmission rod 44 as a straight rod-shaped load transmission member that is loaded into the connecting hook portion 28 of the pair of upper and lower intersecting 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 122. At this time, the center axis of the load transmission rod 44 is substantially parallel to the center axis CP of the steel pipe column 16. Further, the total length of the load transmission rod 44 is longer than the length of the joint cylinder 122, and both end portions thereof protrude from both end surfaces of the joint cylinder 122.

  In the joining structure 120, the load transmission rod 44 and the connecting hook portion 28 and the connecting hook portion 28 and the joint cylinder 122 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 120, the joint cylinder 122, the distal end side including the connecting hook portion 28 of the intersecting main reinforcing bar 20, and the load transmission rod 44 are respectively arranged on the outer peripheral side of the steel pipe column 16, and together with the steel pipe column 16, Buried in Thereby, since the cross main reinforcement 20 is joined to the steel pipe column 16 by the joining structure 120, when a load is transmitted from the outside to the arbitrary cross main reinforcement 20 or an internal stress acts on the cross main reinforcement 20, A part of the transmitted load (compression load or tensile load) is transmitted to the steel pipe column 16 through the load transmission rod 44, the joint cylinder 122, and the concrete layer interposed therebetween.

(Operation of bonding structure)
Next, the operation of the joint structure 120 according to this embodiment will be described. In the joint structure 120 according to this embodiment, the load from the pair of upper and lower intersecting main reinforcing bars 20 is transmitted to the joint cylinder 122 via the load transmission rod 44 and the concrete layer, and therefore the load from the intersecting main reinforcing bars 20 is transmitted to the joint cylinder. Since it can be distributed and transmitted to a wide region extending along the height direction in 122, it is possible to effectively prevent the joint cylinder 122 from being locally deformed by the transmission load from the cross main reinforcing bar 20.

As a result, according to the joint structure 120 according to the present embodiment, the joint tube 122 can be effectively prevented from being locally deformed by the transmission load from the intersecting main reinforcing bars 20, so that the joint tube 122 is deformed. It can also be effectively prevented that the transmission efficiency of the load transmitted from the cross main reinforcing bar 20 to the steel pipe column 16 is lowered.
In the joint structure 120, 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 cylinder 122 can be made extremely simple.

  In addition, in the joining structure 120 according to the present embodiment, for example, a substantially rectangular tube-shaped joint tube can be used as the annular member in addition to the cylindrical joint tube 122. Further, in the joint structure 120 according to the present embodiment, only one load transmission rod 44 is loaded into the connecting hook portion 28 of the pair of upper and lower crossed main reinforcing bars 20, but two or more load transmission rods 44 are paired with the upper and lower pair of upper and lower cross reinforcing bars 20. 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 cross main reinforcement 20 in the joint cylinder 122 to the circumferential direction, the local deformation | transformation of the joint cylinder 122 can be prevented further 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 joint structure 120, a load transmission rod 56 (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 122 from above, and the straight rod portion 52 of the load transmission rod 50 is inside the coupling hook portion 28 and is on the inner peripheral side of the joint cylinder 122. 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 the embodiment of the present invention described above, the fixing end portion is the hook-shaped connecting hook portion 28 or the hook-shaped head portion 82. However, the fixing end portion is provided on the intersecting main reinforcing bar 20, and the annular member and the outer peripheral surface of the column body As long as it is located between them, it is not limited to the hook-shaped connecting hook portion 28 or the hook-shaped head portion 82.

  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 joining structure 30 according to the present embodiment, the steel pipe 24 in the steel pipe column 16 was an outer diameter of 800 mm and a plate thickness of 16 mm, and the steel pipe 24 was filled with concrete to form the steel pipe column 16. 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 Steel pipe columns (supports)
17 outer peripheral surface 18 concrete molding 20 crossing main reinforcing bar 21 lower main reinforcing bar 22 upper main reinforcing bar 24 steel pipe 26 concrete 28 connecting hook part (fixing end part)
30 Joint structure 32, 34 Joint ring (annular member)
36 Base ring part 38 Diaphragm part 36A-36D Side part 40 Circular opening 42 Bending part 44 Load transmission rod (load transmission member)
46 Insertion hole 48 Concrete layer 50 Load transmission rod (load transmission member)
52, 54 Straight bar part 56 Bending part 60 Joint ring (annular member)
62 Base ring part 62A-62D Arc part 64 Reinforcement reinforcement (reinforcement steel)
70 Joint ring (annular member)
72 Diaphragm part 80 Bonding structure 82 Head part (fixing end part)
84, 86 Joint ring 88 Load transmission spacer (load transmission member)
90 Insertion groove 92 Curved surface 94 Reinforcing bar part 100 Joint ring (annular member)
102 Diaphragm part 110 Joining structure 112 Joint ring (annular member)
120 Joining structure 122 Joint cylinder (annular member)
C1, C2 Support pressure CU, CL Concrete support pressure CP Central axis F Horizontal load G Ground surface R1 Tensile force R2 Compressive force

Claims (3)

It is a joint structure between a reinforced concrete load support body having a plurality of reinforcing bars and a column body having an outer peripheral portion formed of a steel pipe and partially embedded in the axial direction inside the load support body. ,
An annular member disposed on the outer peripheral side of the column in the load support;
A fixing end portion provided between at least one of the plurality of reinforcing bars arranged in a direction intersecting with the column body and positioned between the annular member and the outer peripheral surface of the column body;
A load transmitting member disposed between the annular member and the fixing end;
A structure for joining a load support body and a support body characterized by comprising:   The joint structure of a load support body and a column body according to claim 1, wherein the fixing end portion is a hook-shaped connecting hook portion or a hook-shaped head portion.   2. The annular member is arranged at least two on the outer peripheral side of the support body, and a pair of annular members is arranged so as to sandwich a reinforcing bar provided with the fixing end portion. Or the junction structure of the load support body and support | pillar body of 2 description.

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