JP6497482B2 - Beam-column joint structure - Google Patents

Description

The present invention relates to a beam-column joint structure at a joint between a column member and a beam member.
This application claims priority on February 29, 2016 based on Japanese Patent Application No. 2006-037377 for which it applied to Japan, and uses the content here.

  Conventionally, the columns disclosed in Patent Documents 1 to 3 are provided as a column-beam joint structure that greatly simplifies the structure of the joint between the column member and the beam member and is excellent in workability and economy. Beam connection structures have been proposed.

  In the beam-column joint structure disclosed in Patent Document 1, the steel beam is welded in the strong axis direction of the H-shaped steel constituting the steel frame or steel reinforced concrete column. In the column beam connection structure disclosed in Patent Document 1, a column is made of an H-shaped steel having a predetermined relationship between the thickness of the web and the thickness of the flange, and no stiffener or doubler plate is provided. It is characterized by that.

  In Patent Document 2, a welded wire mesh or a reinforcing bar lattice is used as a shear reinforcing bar in a column beam connection structure between a reinforced concrete column and a steel beam. In the column beam connection structure disclosed in Patent Document 2, a welded wire mesh is provided so as to be within a range of a section blocked by a web of beam steel frames, and the horizontal and vertical bars of the welded wire mesh are combined in a grid pattern.

  In Patent Document 3, in a column beam connection structure of a column steel beam and a beam steel frame of a steel reinforced concrete column, reinforcing bars wrapped with each other are provided within a range of a section blocked by a web of a beam steel frame extending in a predetermined direction. . In the column beam connection structure disclosed in Patent Document 3, the reinforcing bars wrapped with each other are arranged in a range where the reinforcing bars are blocked along the web of the beam steel frame extending in a predetermined direction, and are orthogonal within the blocked range. To be inserted into the rebar through hole of the beam steel web.

Japanese Unexamined Patent Publication No. 2001-214514 Japanese Unexamined Patent Publication No. 2005-180100 Japanese Unexamined Patent Publication No. 2006-144474

  Here, the beam-column joint structure disclosed in Patent Document 1 is characterized in that a stiffener or doubler plate or other reinforcing material is not provided on a column made of H-shaped steel, but is provided inside a concrete column. It does not eliminate the need for on-site welding of the reinforcing bars. That is, the beam-column joint structure disclosed in Patent Document 1 does not have a stiffener or doubler plate or the like provided on the column, so that it is possible to shorten the time required for factory production. Since it is not unnecessary, it does not enable shortening of the construction period of site construction.

  On the other hand, the beam-column joint structure disclosed in Patent Documents 2 and 3 shortens the construction period of on-site work by eliminating the need for on-site welding at the wrap portion of the reinforcing bar provided inside the concrete column. Is intended.

  For this reason, the beam-column joint structure disclosed in Patent Document 2 eliminates the need for on-site welding by combining the horizontal and vertical bars of the welded wire mesh in a lattice pattern. The beam-column joint structure disclosed in Patent Document 2 prevents the concrete that becomes the column from falling off by the out-of-plane restraining force of the grid-shaped welded wire mesh. It is provided in the range of the section blocked by the web. At this time, the beam-column joint structure disclosed in Patent Document 2 cannot reinforce a concrete column over the entire circumference because a plurality of welded wire meshes are separated from each other.

  Moreover, the column beam connection structure disclosed by patent document 3 also makes field welding unnecessary by inserting a lap | wrap part in the reinforcing-bars through-hole of the web of a beam steel frame. And the column beam connection structure disclosed in Patent Document 3 is also provided by dividing the reinforcing bars that are wrapped with each other within a section blocked by the web of the beam steel frame extending in a predetermined direction. At this time, the beam-column joint structure disclosed in Patent Document 3 is such that both or one of the reinforcing bars wrapped with each other is arranged with the other end side passing through the outer periphery of the corresponding column main bar perpendicular to the beam steel frame. By arranging along the web of the beam steel frame, the reinforcement bars are divided in the web of the beam steel frame, so that the concrete column cannot be integrally reinforced over the entire circumference. In addition, the column beam connection structure disclosed in Patent Document 3 is such that the wrap portion inserted into the reinforcing bar through-hole of the beam steel frame easily spreads in the out-of-plane direction of the side surface of the concrete column. It is not possible to prevent the concrete from falling off sufficiently.

  The present invention has been devised in view of the above-mentioned problems, and the object of the present invention is to drop off concrete while realizing simple and quick construction at the joint between the column material and the beam material. It is an object of the present invention to provide a column beam connection structure in which the rotational rigidity of the steel beam is improved.

  The gist of the present invention is as follows.

(1) A first aspect of the present invention is a plurality of concrete columns, a steel beam joined to the concrete column, and a plurality of layers provided in a surface layer region of the concrete column at a junction between the concrete column and the steel beam. Reinforcing bars, and each reinforcing bar includes a continuous portion extending from a corner portion to a corner portion of the surface region of the concrete column, bent from both ends of the continuous portion, and A pair of extending portions extending along the surface layer region, and a protruding portion that is bent from one or both of the pair of extending portions and protrudes toward the inside of the concrete column are integrally formed continuously. And the continuous portion formed in each of the plurality of reinforcing bars forms a hoop as a whole over the entire circumference of the surface layer region of the concrete column, and the continuous portions of the reinforcing bars are divided. Not be done The continuous portion of each reinforcing bar is inserted into a through-hole penetrating in the thickness direction of the steel beam, and the length of the extending portion of each reinforcing bar is the steel beam. This is a column beam joint structure that is longer than the length from the end of the through hole to the through hole .

(2) In the column beam connection structure according to (1), the protruding portion may be bent from both of the pair of extending portions and protrude toward the inside of the concrete column.

( 3 ) In the beam-column joint structure according to (1) or (2) , the protruding length of the protruding portion of each reinforcing bar is 10 times or more the diameter of the reinforcing bar, and The length may be half or less than the length of the continuous portion.

( 4 ) In the column beam connection structure according to any one of (1) to ( 3 ) above, the plurality of reinforcing bars are provided by partially overlapping the four reinforcing bars, The continuous portion of the four reinforcing bars may form a hoop over the entire circumference of the surface region of the concrete column as a whole.

( 5 ) In the column beam connection structure according to any one of (1) to ( 4 ), the steel beam and the concrete column may be semi-rigidly bonded or pin-bonded.

( 6 ) In the beam-column joint structure according to any one of (1) to ( 5 ), the steel beam covers an inner portion formed by an upper flange, a lower flange, and a web of the steel beam. A face bearing plate may be provided along the side surface of the concrete pillar.

( 7 ) In the beam-column joint structure according to any one of (1) to ( 6 ), the concrete column may be a steel reinforced concrete column having a steel column therein.

According to the configurations of (1) to ( 7 ) above, the continuous portions of the reinforcing bars form a hoop as a whole over the entire circumference of the surface area of the concrete column at the joint between the concrete column and the steel beam. Therefore, it becomes possible to integrally reinforce the entire circumference of the concrete column. Further, each reinforcing bar extends integrally and continuously without being divided at the continuous portion, so that each reinforcing bar does not easily spread in the out-of-plane direction of the side surface of the concrete column. Therefore, it becomes possible to exert the restraining force by the hoop tension by the combination of a plurality of reinforcing bars, and the concrete column at the joint portion between the steel column and the steel beam can be reliably reinforced. Further, since it is not necessary to provide a welded portion by flare welding or the like on the reinforcing bar, and it is not necessary to provide a mechanical joint, it is possible to easily and quickly provide each reinforcing bar. Furthermore, since the protrusion part which protrudes and extends toward the inside of a concrete pillar is formed in each reinforcing bar, the continuous part and protrusion part of each reinforcing bar are connected by the extension part, and protrusion of each reinforcing bar is carried out. The part can exert resistance within the concrete column. Therefore, it becomes possible to improve the restraint force by the hoop tension by the combination of a plurality of reinforcing bars.

In particular, according to the configuration of ( 5 ) above, the steel beam is semi-rigidly or pin-joined to the concrete column, so that the end of the steel beam is compared with the case where all the steel beams are rigidly joined to the concrete column. By reducing the welding work, it is possible to shorten the construction work period and suppress the increase in quality control costs. In addition, when a steel beam is semi-rigidly or pin-joined to a concrete column, the steel beam tends to rotate and move with respect to the concrete column in the height direction. By acting, it becomes possible to prevent the concrete from falling off the concrete column.

In particular, according to the above configuration ( 6 ), the face bearing plate of each steel beam is provided along the side surface of the concrete column, so that it is possible to suppress the falling of the concrete due to the action of the rotational force. In addition, a pressing force acts on the steel beam from the concrete column and the concrete is prevented from falling off, so that the rotational rigidity of the steel beam can be improved. Furthermore, by using the face bearing plate of each steel beam as a formwork when placing concrete, it is possible to construct a concrete column easily and quickly.

It is a perspective view which shows the state which removed concrete from the beam-column joining structure which concerns on one Embodiment of this invention. It is a top view which shows the junction location of a concrete pillar and a steel beam in the column beam junction structure which concerns on one Embodiment of this invention. It is a front view which shows the junction location of a concrete pillar and a steel beam in the column beam junction structure which concerns on one Embodiment of this invention. It is a top view which shows the protrusion part extended from both extending parts in the column beam junction structure which concerns on one Embodiment of this invention. It is a top view which shows the protrusion part extended from one extending | stretching part by the beam-column joining structure which concerns on one Embodiment of this invention. It is an exploded view which shows the reinforcement reinforcement formed in the substantially C shape by the beam-column joining structure which concerns on one Embodiment of this invention. It is a top view which shows the reinforcement reinforcement formed in the substantially C shape by the beam-column joining structure which concerns on one Embodiment of this invention. It is an exploded view which shows the reinforcement reinforcement formed in the substantially L shape by the column beam junction structure concerning one Embodiment of this invention. It is a top view which shows the reinforcement reinforcement formed in the substantially L shape by the column beam junction structure concerning one Embodiment of this invention. It is an enlarged view which shows the continuous part extended continuously with the reinforcing bar of the beam-column joining structure which concerns on one Embodiment of this invention. It is an enlarged view which shows the flare welding of the conventional column beam connection structure. It is an enlarged view which shows the mechanical joint of the conventional column beam connection structure. It is a top view which shows the state which penetrates the protrusion part of a reinforcement bar | burr by a rotational movement by the column beam joining structure which concerns on one Embodiment of this invention. It is a top view which shows the state which penetrates the extending | stretching part of a reinforcement bar | burr by a rotational movement by the column beam joining structure which concerns on one Embodiment of this invention. It is a top view which shows the state which penetrates the continuous part of a reinforcement bar | burr by a rotational movement by the column beam connection structure which concerns on one Embodiment of this invention by rotation. It is a top view which shows four steel beams joined to the steel column with the beam-column joining structure which concerns on one Embodiment of this invention. It is a front view of the column beam junction structure shown in FIG. 9A. It is a top view which shows the state which rotated and moved the 1st reinforcement bar | burr with the column beam junction structure which concerns on one Embodiment of this invention. It is a front view which shows the state which rotated and moved the 1st reinforcement bar | burr with the beam-column joining structure which concerns on one Embodiment of this invention. It is a top view which shows the state which rotated and moved the 2nd reinforcement bar | burr with the column beam junction structure which concerns on one Embodiment of this invention. It is a front view which shows the state which rotated and moved the 2nd reinforcement bar | burr with the column beam junction structure which concerns on one Embodiment of this invention. It is a top view which shows the state which rotated the 3rd reinforcement bar | burr by the column beam junction structure which concerns on one Embodiment of this invention. It is a front view which shows the state which rotated the 3rd reinforcement bar | burr by the column beam junction structure concerning one Embodiment of this invention. It is a top view which shows the state which rotated and moved the 4th reinforcement bar | burr with the beam-column joining structure which concerns on one Embodiment of this invention. It is a front view which shows the state which rotated and moved the 4th reinforcement bar | burr by the column beam junction structure which concerns on one Embodiment of this invention. It is a top view which shows the state rotated rotationally, expanding the reinforcement bar | burr with the column beam junction structure which concerns on one Embodiment of this invention. It is a front view showing the state where it was rotated and moved while expanding the reinforcing bar in the column beam joint structure concerning one embodiment of the present invention. It is a top view which shows the reinforcing bar of the state hold | maintained by several main bars with the beam-column joining structure which concerns on one Embodiment of this invention. It is a top view which shows the junction location of a concrete column and a steel beam in the column beam junction structure which concerns on one Embodiment of this invention. It is a perspective view which shows the face bearing plate provided in the steel beam by the column beam junction structure which concerns on one Embodiment of this invention. It is a side view which shows the face bearing plate provided in the steel beam by the column beam junction structure which concerns on one Embodiment of this invention. It is a top view which shows the restraint force by the hoop tension | tensile_strength by the combination of several reinforcement bars in the beam-column joining structure which concerns on one Embodiment of this invention. It is a top view which shows the state which the hoop tension | tensile_strength by the combination of a some reinforcing bar generate | occur | produces reliably in the beam-column joining structure which concerns on one Embodiment of this invention. It is a top view which shows the state which sufficient hoop tension does not generate | occur | produce with the conventional column beam junction structure. It is a top view which shows the state by which two steel beams were joined to the steel column by the column beam junction structure which concerns on one Embodiment of this invention. It is a top view which shows the state by which three steel beams were joined to the steel column by the column beam junction structure which concerns on one Embodiment of this invention.

  Hereinafter, a column beam joint structure 1 (hereinafter simply referred to as a column beam joint structure 1) according to an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the column beam connection structure 1 is introduced into a junction between a column material and a steel beam in a building such as a hierarchical structure such as a house, a school, an office, or a hospital facility.

  As shown in FIG. 2, the column beam connection structure 1 includes a concrete column 3 formed by placing concrete, a steel beam 2 bonded to the concrete column 3, and a connection between the concrete column 3 and the steel beam 2. And a plurality of reinforcing bars 4 provided in the surface layer region of the concrete pillar 3 at a location. More specifically, in the beam-to-column connection structure 1, for example, a plurality of steel beams 2 extending in the width direction X and the depth direction Y are bonded to a concrete column 3 extending in the height direction Z (vertical direction). In the present specification, the “surface layer region of the concrete pillar 3” means “a distance 50 between the side face 31 and the central axis from the side face 31 of the concrete pillar 3 in a cross section perpendicular to the axial direction of the concrete pillar 3. % ”Means the area up to the depth position.

  In the column beam connection structure according to the present embodiment, as shown in FIG. 2, the concrete column 3 is a steel reinforced concrete column mainly configured by providing a steel column 5 inside the concrete column 3. However, the concrete pillar 3 may be a reinforced concrete pillar in which the steel pillar 5 is not provided in the interior 30 of the concrete pillar 3.

  The concrete pillar 3 is formed to have a substantially rectangular cross section and the like, and side surfaces 31 are arranged in four directions in the cross section direction, and corners 32 are arranged at four corners of the surface layer region. In the concrete column 3, a reinforcing bar 4 such as a reinforcing bar extending in the width direction X and the depth direction Y and a main reinforcing bar 6 such as a reinforcing bar extending in the height direction Z are provided in the interior 30 of the concrete column 3.

  The concrete pillar 3 is provided in the vicinity of each corner 32 arranged at the four corners so that the main bar 6 extends in the height direction Z in the interior 30 of the concrete pillar 3. The main reinforcement 6 may also be provided at a position separated from each corner 32 in the vicinity of each side surface 31 arranged in four directions.

  The steel column 5 is made of, for example, an H-shaped steel having a substantially H-shaped cross section, and a first flange 51 and a second flange 52 that are paired on both sides in the width direction X are disposed. The steel column web 53 is constructed from the second flange 52 to the second flange 52. The steel column 5 is provided in the interior 30 of the concrete column 3 so as to extend in the height direction Z, being arranged at the approximate center in the cross-sectional direction.

  The steel beam 2 is provided so as to extend in one direction or a plurality of directions in a plan view at a joint portion with the concrete column 3. The steel beam 2 may be provided extending in only one direction in either the width direction X or the depth direction Y, or may be provided extending in a plurality of directions in both the width direction X and the depth direction Y. Further, the steel beam 2 may be provided only on one side of the concrete column 3 in addition to being provided on both sides of the concrete column 3 in the width direction X or the depth direction Y.

  The steel beam 2 extends in a plurality of directions in both the width direction X and the depth direction Y and is provided on both sides of the concrete column 3, so that the four steel beams 2 are joined to one concrete column 3. . The steel beam 2 extends only in one direction and is provided on both sides of the concrete column 3, or extends in a plurality of directions and provided on one side or both sides of the concrete column 3, thereby providing one concrete column 3. Two or three steel beams 2 are joined to each other.

  The steel beam 2 is rigidly joined to the concrete column 3 by welding the ends of the steel beam 2 extending in the width direction X to the first flange 51 and the second flange 52 of the steel column 5, for example. On the other hand, in the steel beam 2, for example, the ends of the steel beam 2 extending in the depth direction Y are bolted to the connection steel plates 24 attached to both surfaces of the steel column web 53 of the steel column 5 by welding or the like. Thus, the concrete pillar 3 is semi-rigidly joined or pin-joined.

  The steel beam 2 is preferably a semi-rigid or pin-bonded part or all of the steel beam 2 extending in one direction or a plurality of directions at a joint location with the concrete column 3. The steel beam 2 may be semi-rigidly bonded or pin-bonded to the concrete column 3, for example, only two steel beams 2 extending in one direction among the four steel beams 2 extending in a plurality of directions. Further, the steel beam 2 may be semi-rigidly or pin-bonded to the concrete column 3 in the entirety of the four steel beams 2 extending in a plurality of directions.

  Here, the semi-rigid joint refers to a joint form in which the rotational movement of the steel beam 2 with respect to the concrete column 3 is restricted to some extent, and refers to a material having a small bending stress that can be transmitted between the concrete column 3 and the steel beam 2. The pin joint refers to a joint type that does not constrain the rotational movement of the steel beam 2 with respect to the concrete column 3 and means that there is no or minimal bending stress that can be transmitted between the concrete column 3 and the steel beam 2. The definitions of semi-rigid joint, pin joint, and rigid joint shall conform to European design standards (Eurocode 3 Part 1-8) in particular.

  As shown in FIG. 3, for example, an H-shaped steel having a substantially H-shaped cross section is used for the steel beam 2, and a pair of an upper flange 21 and a lower flange 22 in the height direction Z are disposed. A web 23 is constructed from the upper flange 21 to the lower flange 22. As shown in FIG. 1, the steel beam 2 is particularly formed with a through hole 20 that penetrates the web 23 of the steel beam 2 in the plate thickness direction. When the steel beam 2 is semi-rigidly or pin-bonded to the concrete column 3, the web 23 of the steel beam 2 is bolted to the connecting steel plate 24 attached to the steel column web 53 of the steel column 5.

  As shown in FIG. 3, the main reinforcement 6 is provided with a plurality of reinforcing bars extending in the height direction Z, and the plurality of main reinforcements 6 are restrained by the band reinforcement 61. For example, a deformed reinforcing bar is used as the band 61, and is provided so as to surround the plurality of main bars 6 over the entire circumference. The band 61 is provided over a plurality of steps in the height direction Z above and below the steel beam 2 as necessary.

  The reinforcing bars 4 are provided in the surface layer region of the concrete column 3 around the steel column 5. The reinforcing bars 4 are provided so as to extend in the width direction X and the depth direction Y and restrain the plurality of main bars 6. For example, the reinforcing bars 4 are provided in two steps in the height direction Z between the upper flange 21 and the lower flange 22 of the steel beam 2. The reinforcing bars 4 are provided so as to partially overlap each other in the height direction Z in a state where a plurality of adjacent reinforcing bars 4 are in contact with or separated from each other.

  As shown in FIG. 4A and FIG. 4B, each reinforcing bar 4 is a deformed reinforcing bar or a deformed bar formed in a substantially C-shaped open shape. Each reinforcing bar 4 includes a continuous portion 41 extending in the width direction X or the depth direction Y from the corner portion 32 to the corner portion 32 of the surface layer region of the concrete column 3, and bent at substantially right angles from both ends of the continuous portion 41. A pair of extending portions 42 extending in this manner, and a protruding portion 43 that is bent substantially at a right angle from one end of the extending portion 42 and protrudes toward the inside of the concrete column 3 are formed integrally and continuously.

  Each reinforcing bar 4 is continuous along the inner side of the side surface 31 of the concrete column 3 from the corner 32 to the corner 32 adjacent to each other of the concrete column 3, and the continuous portion 41 has a predetermined length B. Extend. Each reinforcing bar 4 extends continuously from the corner 32 of the concrete column 3 along the inner side of the side surface 31 and extends at a predetermined length D that is less than half the length B of the continuous portion 41. The part 42 extends. Further, each reinforcing bar 4 is continuously extended from the side surface 31 of the concrete column 3 toward the inside 30, and a protruding portion 43 extends with a predetermined protruding length L.

  Each reinforcing bar 4 has a diameter d of about 6 mm to 10 mm, for example. Each reinforcing bar 4 mainly has a protruding length L of the protruding part 43 protruding toward the interior 30 of the concrete column 3 that is 10 times or more the diameter d of the reinforcing bar 4 and the length B of the continuous part 41. Less than half of the length. Each reinforcing bar 4 has a protruding length L of the protruding portion 43 of about 60 mm to 100 mm, for example.

  Each reinforcing bar 4 is formed with a protruding portion 43 that extends continuously from either one or both of the pair of extending portions 42 and protrudes toward the interior 30 of the concrete column 3. As shown in FIG. 4A, each reinforcing bar 4 is formed with a pair of projecting portions 43 projecting from both of the pair of extending portions 42, and as shown in FIG. A protrusion 43 that protrudes from only one of the protrusions 43 may be formed.

  As shown in FIGS. 5A, 5B, 6A, and 6B, each reinforcing bar 4 includes a plurality of reinforcing bars 4 so as to surround the side surface 31 of the concrete column 3 over the entire circumference in the cross-sectional direction. Each continuous portion 41 of the muscle 4 is arranged. That is, each continuous part 41 of the plurality of reinforcing bars 4 is arranged so as to form a hoop over the entire circumference of the surface layer region of the concrete column 3 as a whole. The plurality of reinforcing bars 4 are integrally provided over the entire circumference of the concrete column 3 by arranging the continuous portions 41 on the four side surfaces 31 of the concrete column 3.

  As shown in FIG. 5A, the plurality of reinforcing bars 4 are mainly used by combining four reinforcing bars 4. At this time, as shown in FIG. 5B, the plurality of reinforcing bars 4 are each formed with a continuous portion 41 at one location by each reinforcing bar 4, and each reinforcing bar 4 extends over the entire surface area of the concrete pillar 3. A continuous portion 41 formed on the line 4 is arranged in a hoop shape. The plurality of reinforcing bars 4 are provided in a state where the four reinforcing bars 4 are in contact with or separated from each other, and the continuous portion 41 and the extending portion 42 of each reinforcing bar 4 are partially connected in the height direction Z to each other. It will be a superposition of.

  As shown in FIG. 6A, the plurality of reinforcing bars 4 may be used in combination of two reinforcing bars 4 formed in a substantially L-shaped open shape. At this time, the plurality of reinforcing bars 4 are formed with continuous portions 41 at two locations in each reinforcing bar 4, and a bent portion 40 bent at a substantially right angle is formed between the two continuous portions 41. A pair of extending portions 42 are formed continuously from both ends of the continuous portion 41 formed in two places. As shown in FIG. 6B, the plurality of reinforcing bars 4 are provided in a state where the two reinforcing bars 4 are in contact with or separated from each other, and the continuous portion 41 and the extending portion 42 of each reinforcing bar 4 are connected to each other. It is a partial overlap in the height direction Z. The plurality of reinforcing bars 4 include one open reinforcing bar 4 in which bent portions 40 are formed at two places between the continuous parts 41 formed at three places, and a substantially C-shaped reinforcing bar 4 shown in FIG. 4A. The reinforcing bars 4 may be used in combination.

  Each reinforcing bar 4 is divided at the continuous portion 41 as shown in FIG. 7A by the continuous portion 41 extending continuously from the corner portion 32 to the corner portion 32 of the surface layer region of the concrete column 3. Formed without. Each reinforcing bar 4 is formed without being divided at the continuous portion 41, and continuously without being joined by a flare welding shown in FIG. 7B or a mechanical joint such as the coupler 90 shown in FIG. 7C. The part 41 extends continuously.

  For example, as shown in FIG. 8A, each reinforcing bar 4 is rotationally moved with respect to the steel beam 2 so that the continuous portion 41 is inserted into the through-hole 20 that penetrates each web 23 of the plurality of steel beams 2. And attached to each steel beam 2. Each reinforcing bar 4 is inserted into the through hole 20 through the protrusion 43 as shown in FIG. 8A, and then inserted into the through hole 20 as shown in FIG. 8B, and the continuous portion 41 as shown in FIG. 8C. Is inserted through the through hole 20. While each reinforcing bar 4 is attached to each steel beam 2, the steel beam 2 is carried into a construction site or the like. FIG. 9A, FIG. 9B, FIG. 10A, FIG. 10B, FIG. 11A, FIG. As shown to FIG. 12A, FIG. 12B, FIG. 13A, and FIG. 13B, you may attach to each steel beam 2 at a construction site.

  As shown in FIG. 9A to FIG. 15, the beam-column joint structure 1 is provided with a plurality of reinforcing bars 4 at the joint between the concrete column 3 and the steel beam 2. The column beam connection structure 1 is provided so that the extending portion 42 and the protruding portion 43 of the reinforcing bar 4 do not interfere with the web 23 of the steel beam 2, and the continuous part 41 of the reinforcing bar 4 penetrates the web 23 of the steel beam 2. It is inserted through the hole 20.

  As shown in FIGS. 9A and 9B, the beam-column joining structure 1 is first installed with the steel beam 2 extending in one direction or a plurality of directions before the concrete of the concrete column 3 is placed. At this time, for example, the two steel beams 2 extending in the width direction X are rigidly joined to the steel columns 5 of the concrete columns 3 and the two steel beams 2 extending in the depth direction Y are concrete columns. The steel column 5 is semi-rigidly or pin-joined by the connecting steel plate 24.

  Next, as shown in FIG. 10A and FIG. 10B, the beam-column joint structure 1 is, for example, a joint where two steel beams 2 extending in the width direction X are installed. An eye reinforcement 4 is provided. At this time, the first reinforcing bar 4 is rotationally moved in the height direction Z with the continuous portion 41 inserted through the through hole 20 of the web 23 of the steel beam 2 as a rotation axis.

  Next, as shown in FIGS. 11A and 11B, the beam-column joint structure 1 has the second reinforcing bar 4 on the opposite side of the first reinforcing bar 4 in two steps in the height direction Z. Provided. At this time, the second reinforcing bar 4 is also rotationally moved in the height direction Z with the continuous portion 41 as the rotation axis.

  Next, as shown in FIGS. 12A and 12B, the beam-column joint structure 1 is a joint where the steel beam 2 extending in the depth direction Y is installed. A third reinforcing bar 4 is provided in two stages in the height direction Z in a state where the two reinforcing bars are overlapped with each other. At this time, the third reinforcing bar 4 is also rotationally moved in the height direction Z with the continuous portion 41 as the rotation axis.

  Next, as shown in FIGS. 13A and 13B, the beam-column joint structure 1 is partially overlapped with the first and second reinforcing bars 4 on the opposite side of the third reinforcing bar 4. In the state, a fourth reinforcing bar 4 is provided in two steps in the height direction Z. At this time, the fourth reinforcing bar 4 is also rotationally moved in the height direction Z with the continuous portion 41 as the rotation axis.

  Finally, in the beam-column joint structure 1, the concrete of the concrete column 3 is placed in a state in which the plurality of reinforcing bars 4 are temporarily fixed by a number line or the like and held in a position so as not to rotate. 14A and 14B, when the main bar 6 is provided in advance on the concrete column 3, the beam-column joining structure 1 interferes with the main bar 6 by expanding and deforming each reinforcing bar 4. The reinforcing bar 4 is rotationally moved in the height direction Z so that it does not occur.

  As shown in FIG. 15, the column beam connection structure 1 is provided with a main bar 6 in the vicinity of each corner 32 of the concrete column 3, and also at a position separated from each corner 32 of the concrete column 3. 6 may be provided. At this time, the beam-column joining structure 1 has the main reinforcement 6 at the corner 32 of the concrete column 3 and the main reinforcement 6 at a position separated from the corner 32 without temporarily fixing the plurality of reinforcing bars 4 with a line or the like. The reinforcing bars 4 are locked, and the plurality of reinforcing bars 4 are held in position.

  Moreover, in the beam-column joint structure 1, a reinforced concrete column may be used as the concrete column 3 as shown in FIG. 16 without the steel column 5 being provided in the interior 30 of the concrete column 3. At this time, for example, the end of the steel beam 2 extending in the depth direction Y is bolted to the connecting steel plate 24 of the web 23 of the steel beam 2 extending in the width direction X to the concrete column 3. Semi-rigid or pinned.

  As shown in FIG. 17, the beam-column joining structure 1 includes a face bearing plate 25 that covers the inner flange 26 formed by the upper flange 21, the lower flange 22 and the web 23 of the steel beam 2 as required. The steel beam 2 may be provided. As shown in FIG. 18, the column beam connection structure 1 includes a face bearing plate 25 of each steel beam 2 provided along the side surface 31 of the concrete column 3, and a boundary with the interior 30 of the concrete column 3, or In the interior 30 of the concrete pillar 3.

  As shown in FIG. 19, the beam-column joint structure 1 includes continuous portions 41 formed in each of the plurality of reinforcing bars 4 so as to surround the side surface 31 of the concrete column 3 over the entire circumference in the cross-sectional direction. The At this time, the beam-column joint structure 1 is provided integrally without dividing the plurality of reinforcing bars 4 over the entire circumference of the side surface 31 of the concrete column 3, thereby integrating the entire circumference of the concrete column 3. Can be reinforced.

  In the beam-to-column connection structure 1, the steel beam 2 is semi-rigidly or pin-bonded to the concrete column 3, so that the steel beam 2 is easily rotated in the height direction Z with respect to the concrete column 3. At this time, the beam-column joint structure 1 integrally reinforces the entire circumference of the concrete column 3 with the plurality of reinforcing bars 4 and applies the restraining force F due to the hoop tension by the combination of the plurality of reinforcing bars 4. It becomes possible to prevent the concrete of the concrete pillar 3 from falling off.

  Further, in the beam-column joint structure 1, each reinforcing bar 4 is formed with a protruding portion 43 that protrudes and extends toward the inside 30 of the concrete column 3, so that each reinforcing bar 4 protrudes inside the concrete column 3. The portion 43 exhibits the resistance force R. At this time, in the beam-column joint structure 1, the protrusion 43 of each reinforcing bar 4 exhibits the resistance R, and the continuous part 41 and the protruding part 43 are connected by the extending part 42. It is possible to improve the restraining force F due to the hoop tension at the continuous portion 41.

  The column beam connection structure 1 is particularly compared with the case where all or all steel beams 2 are rigidly joined to the concrete columns 3 because some or all of the steel beams 2 are semi-rigidly or pin-joined to the concrete columns 3. The welding work at the end of the steel beam 2 can be reduced. At this time, the beam-column joining structure 1 can reduce the construction work period by reducing the welding work of the end portion of the steel beam 2, and can suppress an increase in the cost of quality control.

  In addition, as shown in FIG. 7A, the beam-column joining structure 1 extends continuously without the reinforcing bars 4 being divided at the continuous portion 41. At this time, the column beam connection structure 1 does not need to provide the welded portion W by flare welding or the like shown in FIG. 7B, and does not need to provide the wet or dry mechanical joint shown in FIG. 7C. A plurality of reinforcing bars 4 can be provided easily and quickly.

  In addition, as shown in FIG. 20A, the beam-column joining structure 1 is such that each reinforcing bar 4 extends continuously without being divided by the continuous portion 41, so that each reinforcing bar 4 is a side surface 31 of the concrete column 3. It becomes difficult to spread in the out-of-plane direction. At this time, in the beam-column joint structure 1, each reinforcing bar 4 is difficult to expand in the out-of-plane direction, and the hoop tension due to the combination of the plurality of reinforcing bars 4 is surely generated. It becomes possible to make it. On the other hand, in the conventional beam-column joint structure 9, as shown in FIG. 20B, the wrap portions 91 that are wrapped with each other easily spread in the out-of-plane direction, and sufficient hoop tension is not generated in the shear reinforcement bars. In the conventional beam-column joint structure 9, the lap portion 91 is inserted into the reinforcing bar through hole of the beam steel frame, but a clearance is generally provided in the reinforcing bar through hole. Since 91 is easily removed from the reinforcing bar through hole, sufficient hoop tension is not generated in the shear reinforcing bar. For this reason, in the conventional beam-column joint structure 9, it is not possible to sufficiently prevent the concrete from falling off.

  As shown in FIG. 18, in the beam-to-column connection structure 1, the steel beam 2 is semi-rigidly bonded or pin-bonded to the concrete column 3, so that the rotational force M acts on the concrete column 3 from the steel beam 2. At this time, in the beam-column joint structure 1, the face bearing plate 25 of each steel beam 2 is provided along the side surface 31 of the concrete column 3, so that it is possible to suppress the falling of concrete due to the action of the rotational force M. It becomes. In addition, the beam-to-column connection structure 1 is such that the pressing force P in the height direction Z acts on the upper flange 21 and the lower flange 22 of the steel beam 2 from the concrete column 3 and the concrete is prevented from falling off. It is also possible to improve the rotational rigidity of 2. Furthermore, the column beam connection structure 1 constructs the concrete column 3 simply and quickly by using the face bearing plate 25 of each steel beam 2 as a formwork when placing concrete of the concrete column 3. It becomes possible.

  In the beam-column joining structure 1, one reinforcing bar 4 is attached to one steel beam 2 as shown in FIG. 19. And when the four steel beam 2 is joined to one concrete pillar 3, the four beam reinforcing bars 4 formed in the substantially C shape shown to FIG. 5A and FIG. Used. In addition, as shown in FIG. 21A, in the column beam connection structure 1, when two steel beam 2 are bonded, four substantially C-shaped reinforcing bars 4 are used, as well as FIGS. 6A and 6B. Two substantially reinforcing bars 4 having a substantially L shape shown in FIG. Furthermore, as shown in FIG. 21B, the column beam connection structure 1 uses four substantially C-shaped reinforcing bars 4 in addition to two substantially C-shaped reinforcing bars 4 when three steel beam 2 are bonded. The shape reinforcing bar 4 and one substantially L-shaped reinforcing bar 4 may be used in combination.

  As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be interpreted in a limited way.

  According to the present invention, it is possible to provide a column beam joint structure that prevents the dropping of concrete and improves the rotational rigidity of the steel beam while realizing simple and quick construction at the joint portion between the column member and the steel beam. be able to.

1: Column beam connection structure 2: Steel beam 20: Through hole 21: Upper flange 22: Lower flange 23: Web 24: Connection steel plate 25: Face bearing plate 26: Inner part 3: Concrete column 30: Interior 31: Side surface 32 : Corner part 4: Reinforcement bar 40: Bending part 41: Continuous part 42: Extension part 43: Projection part 5: Steel column 51: First flange 52: Second flange 53: Steel column web 6: Main bar 61: Tie 9 : Conventional column beam connection structure X: Width direction Y: Depth direction Z: Height direction

Claims (7)

Concrete pillars,
A steel beam joined to the concrete column;
A plurality of reinforcing bars provided in a surface layer region of the concrete column at a joint portion between the concrete column and the steel beam;
With
Each reinforcing bar includes
A continuous portion extending from a corner to a corner of the surface region of the concrete column;
A pair of extending portions bent from both ends of the continuous portion and extending along the surface region of the concrete column;
A protrusion that bends from one or both of the pair of extending portions and protrudes toward the inside of the concrete column;
Is integrally formed continuously,
The continuous portion formed in each of the plurality of reinforcing bars forms a hoop over the entire circumference of the surface layer region of the concrete column as a whole ,
The continuous portion of each reinforcing bar is formed continuously without being divided,
The continuous portion of each reinforcing bar is inserted into a through-hole penetrating in the thickness direction of the steel beam,
The length of the extending portion of each reinforcing bar is longer than the length from the end of the steel beam to the through hole,
Column beam connection structure characterized by that. The column beam connection structure according to claim 1, wherein the protruding portion is bent from both of the pair of extending portions and protrudes toward the inside of the concrete column. The protruding length of the protruding portion of each reinforcing bar is 10 times or more the diameter of the reinforcing bar and half or less the length of the continuous portion. 3. The beam-column joint structure according to 1 or 2 . The plurality of reinforcing bars are provided by partially overlapping the four reinforcing bars, so that the continuous part of the four reinforcing bars extends over the entire circumference of the surface layer region of the concrete column as a whole. The beam-to-column connection structure according to any one of claims 1 to 3 , wherein a hoop is formed. The beam-to-column connection structure according to any one of claims 1 to 4 , wherein the steel beam and the concrete column are semi-rigidly bonded or pin-bonded. The steel beam, the flange on the steel beam, the face bearing plate which covers the clear width portion formed in a lower flange and web, according to claim 1 to 5, characterized in that provided along the sides of the concrete pillar The beam-column joint structure according to any one of the above. The beam-column joint structure according to any one of claims 1 to 6 , wherein the concrete column is a steel-framed reinforced concrete column having a steel column inside.

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