JP2016196788A - Structure for joining column and beam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for joining a column and a beam, which enables the column of reinforced concrete construction and the beam of steel construction to be joined together with proper workability.SOLUTION: A structure 100 for joining a column and a beam is used to join the beam 2 of steel construction, and the column 1 of reinforced concrete construction, which has a concrete part 12 and a main reinforcement 10 extended in a vertical direction and protruding from a top surface 12Y of the concrete part 12. The structure includes: a support frame part 12S that is protruded upward from the top surface 12Y of the concrete part 12 and formed like a frame in a plan view; a sealing member 3 that is joined to the beam 2, supported by the support frame part 12S and formed to surround the main reinforcement 10; and a joint concrete part 4 that is infilled to range from the inside of the support frame part 12S to the inside of the sealing member 3.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a joint structure between a column and a beam.

  Conventionally, an RCSS construction method for joining a reinforced concrete column and a steel beam is known (see, for example, Patent Document 1). Buildings constructed with the RCSS construction method are made of high-strength and high-seismic structures utilizing the good materials of reinforced concrete and steel frames.

  The following is known as a joint structure between a column and a beam joined by the RCSS construction method. For example, a beam provided with a support portion projecting downward is installed on an upper portion of a pillar having a concrete portion and a plurality of main bars projecting upward from the upper surface of the concrete portion. At the joint between the column and the beam, a support portion is installed on the upper surface of the concrete portion of the column, and a blocking form is provided between the upper surface of the column and the lower surface of the beam so as to surround the main bar protruding from the concrete portion. And the concrete upper part and the lower part of a beam are joined by placing concrete inside the cover mold.

  Further, a thin plate or the like is provided on the lower surface of the beam, and the beam is installed on the upper portion of the column so that a gap corresponding to the thin plate is generated between the lower surface of the beam and the upper surface of the concrete portion. There is also a configuration in which the column and the beam are joined by injecting a grout material around the thin plate in the gap between the upper surface of the column and the lower surface of the beam.

Japanese Patent No. 2554535

However, in the configuration in which the above-mentioned cover mold is provided and the concrete is cast, the paste-like concrete attached to the concrete part of the pillar that protrudes from the mold after removal or removal of the paste is removed. There are many tasks such as cleansing and cleaning. Further, in the configuration in which the grout material is injected to join the column and the beam, the grout material protruding from the gap between the column and the beam must be removed. Furthermore, in any configuration, a fireproof coating may be applied from the beam to the vicinity of the top of the column so that the paste-like concrete or grout material that protrudes is not visible. Thus, there is a problem that workability is poor.
In particular, a building with a high floor height such as a large space is required to work at a high place, so safety is important and work with good workability is desired.

  Therefore, the present invention has been made in view of the above circumstances, and provides a column-to-beam joint structure capable of joining a reinforced concrete column and a steel beam with good workability.

In order to achieve the above object, the present invention employs the following means.
That is, the column / beam joint structure according to the present invention is a joint structure of a reinforced concrete column having a concrete part, a main bar extending in the vertical direction and protruding from the upper surface of the concrete part, and a steel beam. And a support frame portion protruding upward from the upper surface of the concrete portion and formed in a frame shape in plan view, joined to the beam, supported by the support frame portion, and formed to surround the main bar. It is characterized by comprising a cover member and a joint concrete portion filled from the inside of the support frame portion to the inside of the cover member.

In the joint structure of a column and a beam thus configured, a support frame portion that protrudes upward and is formed in a frame shape in plan view is provided on the upper surface of the concrete portion of the column. Thereby, the part enclosed by the support frame part is made into the recessed part dented below from the upper surface of a support frame part. A joint concrete portion filled with concrete is formed from the recess to the inside of a cover member joined to the beam and supported by the support frame portion and surrounding the main reinforcement. Therefore, the upper part of the column and the lower part of the beam can be joined by the joined concrete part.
Further, the support frame portion formed in the shape of a frame in plan view functions as a mold frame without providing a mold frame for general concrete placement. Therefore, work such as installation of a mold or removal of a mold is unnecessary, and workability can be improved.

  Moreover, it is preferable that the joining structure of the pillar and beam which concerns on this invention is further provided with the support part which protrudes from the upper surface of the said concrete part, and supports the said beam.

  In the joint structure of a column and a beam constructed in this way, for example, even when the strength of the support frame is insufficient to support the beam only with the support frame, the support is projected from the upper surface of the concrete part. Since the beam is also supported, the column can reliably support the beam.

  Moreover, in the joining structure of a column and a beam according to the present invention, the support frame portion may be formed with a non-land adjustment portion that rises upward and supports the blocking member.

  In the joint structure of the column and the beam configured as described above, for example, when the column is slightly inclined due to an error or the like, the unevenness adjustment portion that rises upward from the support frame portion supports the blocking member. . Therefore, the unevenness adjustment part can absorb the inclination of the column and support the beam in an appropriate posture.

  According to the joining structure of a column and a beam according to the present invention, a reinforced concrete column and a steel beam can be joined with good workability.

It is a perspective view which shows the joining structure of the pillar and beam which concern on 1st embodiment of this invention. It is AA sectional drawing of FIG. It is a perspective view which shows the pillar used as the joining object of the joining structure of the pillar and beam which concerns on 1st embodiment of this invention. It is a perspective view which shows the pillar used as the joining object of the joining structure of the pillar and beam which concerns on 2nd embodiment of this invention. It is a perspective view which shows the pillar used as the joining object of the joining structure of the pillar and beam which concerns on 3rd embodiment of this invention. It is a perspective view which shows the pillar used as the joining object of the joining structure of the pillar and beam which concerns on 4th embodiment of this invention. It is a figure corresponded in AA sectional drawing of FIG. 1 in the junction structure of the pillar and beam which concerns on 4th embodiment of this invention. It is a perspective view which shows the pillar used as the joining object of the joining structure of the pillar and beam which concerns on the modification of 2nd embodiment of this invention.

(First embodiment)
A column-to-beam joint structure according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a joint structure between a column and a beam according to the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. In addition, in FIG. 1, description of the joint concrete part is abbreviate | omitted.

  As shown in FIGS. 1 and 2, a reinforced concrete column 1 and a joint structure 2 </ b> A are joined by a joint structure 100 of a column and a beam.

FIG. 3 is a perspective view showing the pillar 1 to be joined in the joining structure 100 between the pillar and the beam.
As shown in FIG. 3, the pillar 1 is vertically arranged so as to bundle a plurality of main bars 10, 10..., Which are arranged at a predetermined interval in the horizontal direction and extend in the vertical direction, and the plurality of main bars 10, 10. Filled in a substantially rectangular shape in plan view so as to cover a plurality of strips (not shown; the same applies hereinafter) arranged at intervals in the direction, the plurality of main bars 10, 10,. It has a column concrete part (concrete part) 12 which is concrete. In the present embodiment, the pillar is composed of a precast concrete member that is manufactured in advance at a factory or the like and then carried into a construction site. In the present embodiment, for example, the pillar 1 is 1000 mm × 1000 mm square.

  At the edge of the upper surface 12Y of the column concrete portion 12, a support frame portion 12S that protrudes upward and is formed in a four-sided frame shape in plan view is formed integrally with the column concrete portion 12. Thereby, the portion surrounded by the support frame portion 12S is a recess 12Z that is recessed downward from the upper surface 12T of the support frame portion 12S. In the present embodiment, for example, the depth of the recess 12Z is 100 mm, and the width of the support frame portion 12S is 150 mm.

  Three main bars 10, 10... Are provided at four corners of the column concrete portion 12, respectively. The three main muscles 10 provided at each corner are the main muscles 10P arranged on the corner side and the main muscles provided at a position separated from the main muscle 10P by a predetermined distance along one side of the pillar 1 forming a rectangular shape in plan view. 10 </ b> Q and a main muscle 10 </ b> R provided at a position separated from the main muscle 10 </ b> P by a predetermined distance along another side orthogonal to one side.

The upper part 10 </ b> A of each main reinforcing bar 10 protrudes from the support frame part 12 </ b> S of the column concrete part 12.
In addition to the main muscles 10P, 10Q, and 10R, the main muscles 10, 10... May be another main muscle (not shown; the same applies hereinafter), and may be configured as a set of four. In this case, it is preferable to arrange the other main muscle at a position that forms a rectangular apex with the main muscles 10P, 10Q, and 10R in plan view. The other main reinforcing bar may protrude from the support frame portion 12S of the column concrete portion 12, or may protrude from the bottom surface (upper surface of the column concrete portion 12) 12Y of the recess 12Z.

  As shown in FIGS. 1 and 2, the joint structure 2 </ b> A includes a steel beam joint (beam) 2 and a cover plate 3 joined to the beam joint 2.

  The beam joint portion 2 is configured such that a first beam joint portion 21 and a second beam joint portion 22 that are H-shaped steel are arranged orthogonally to each other and joined together. The first beam joint portion 21 includes upper and lower flanges 21A and 21A that are spaced apart in the vertical direction, and a web 21B that connects the flanges 21A and 21A. The second beam joint portion 22 includes upper and lower flanges 22A and 22A that are spaced apart in the vertical direction, and a web 22B that connects the flanges 22A and 22A.

  In a portion where the first beam joint 21 and the second beam joint 22 are orthogonal to each other, the flange 21A of the first beam joint 21 and the flange 22A of the second beam joint 22 are integrated by welding or the like. In addition, the web 21B of the first beam joint 21 and the web 22B of the second beam joint 22 are integrated with each other by welding or the like.

  The beam joint 2 is installed on the top of the column 1. Specifically, the lower flanges 21 </ b> A and 22 </ b> A of the beam joint portion 2 are placed on the support frame portion 12 </ b> S of the column concrete portion 12 of the column 1.

  The cover plate 3 is installed along the outer periphery of the support frame portion 12 </ b> S of the column concrete portion 12 of the column 1. Thus, the cover board 3 is arrange | positioned so that all the main reinforcements 10, 10 ... may be enclosed.

  The cover plate 3 has a rectangular shape in plan view and is formed in a cylindrical shape extending in the vertical direction. The cover plate 3 and the beam joint portion 2 are joined and integrated by welding or the like. For example, a thin steel plate can be adopted as the cover plate.

A joint concrete portion 4 filled with concrete is formed from the inside of the cover plate 3 to the concave portion 12Z of the column 1.
In this embodiment, the support frame portion 12S of the pillar 1, the cover plate 3, and the joint concrete portion 4 constitute a joint structure 100 of the pillar and the beam.

  When the pillar 1 and the beam joint 2 are joined by the joint structure 100 between the pillar and the beam, the pillar 1 is lifted by a crane (not shown) or the like and built in a predetermined position. Next, the joint structure 2A is installed on the top of the column 1. At this time, the lower flanges 21A and 22A of the beam joint portion 2 are installed on the support frame portion 12S of the column concrete portion 12 of the column 1, and the cover plate 3 is installed along the outer periphery of the support frame portion 12S. To.

  Then, concrete is placed from the gap between the upper portion of the cover plate 3 and the upper flange 21A of the beam joint portion 2. Concrete is filled from the recess 12Z of the pillar 1 to the inside of the cover plate 3 and hardened. The upper part of the column 1 and the joint structure 2A are joined by the joint concrete portion 4 formed of the hardened concrete.

In addition, a steel-structured long beam member (not shown; the same applies hereinafter) is bridged between the joint structures 2A, 2A of the adjacent columns 1, and the ends of the steel-structured beam member are connected to each other. The mouth structure 2A is joined by welding, bolt joining, or the like.
Alternatively, a configuration in which the joint structure 2A and the long beam member are integrated in advance and joined to the column 1 may be employed.

  In the column-to-beam joint structure 100 configured as described above, the upper surface 12Y of the column concrete portion 12 is provided with a support frame portion 12S that protrudes upward and has a frame shape in plan view. Thereby, the portion surrounded by the support frame portion 12S is a recess 12Z that is recessed downward from the upper surface 12T of the support frame portion 12S. A joint concrete portion 4 filled with concrete is formed from the recess 12Z to the inside of the cover plate 3 that is supported by the support frame portion 12S and covers the main reinforcement 10 of the column 1 and to which the beam joint portion 2 is joined. Therefore, the upper part of the pillar 1 and the beam joint part 2 can be joined by the joint concrete part 4.

  Further, the support frame portion 12S and the cover plate 3 formed in a planar view frame shape function as a mold frame without providing a mold frame for general concrete placement. Therefore, work such as installation of formwork and removal of white powdery powder attached to the concrete part of the pillar after demolding and demolding is unnecessary, improving workability and shortening the construction period. can do. Moreover, especially in a building with a high floor height such as a large space, the above work does not have to be performed, so safety can be ensured.

(Second embodiment)
Next, the column-beam joint structure according to the second embodiment of the present invention will be described mainly with reference to FIG.
In the following embodiments, the same members as those used in the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted.

FIG. 4 is a perspective view showing a pillar to be joined in a joint structure of a pillar and a beam according to the second embodiment of the present invention.
As shown in FIG. 4, in this embodiment, the pillar 1S is provided with a supporting concrete portion (supporting portion) 13 protruding from the bottom surface 12Y of the recess 12Z.

  The supporting concrete portion 13 protrudes from a substantially central portion in plan view of the bottom surface 12Y of the recess 12Z. The supporting concrete part 13 has a rectangular parallelepiped shape. The upper surface 13A of the supporting concrete portion 13 has substantially the same height as the upper surface 12T of the supporting frame portion 12S.

  In the joint structure of the column and the beam thus configured, not only the support frame portion 12S of the column 1S but also the support concrete portion 13 supports the beam joint portion 2, so that the column 1S reliably supports the beam joint portion 2. can do. For example, even when the strength of the support frame portion 12S is insufficient to support the beam joint portion 2 only by the support frame portion 12S of the pillar 1S, the support concrete portion 13 also supports the beam joint portion 2, so the column 1S. Reliably supports the beam joint 2. Moreover, by providing the support concrete part 13, the width | variety of the support frame part 12S can be made small and the adhesion area of the pillar 1 and the joining concrete part 4 can be ensured large.

(Third embodiment)
Next, the column-beam joint structure according to the third embodiment of the present invention will be described mainly with reference to FIG.

FIG. 5 is a perspective view showing a column to be joined in a joined structure of a column and a beam according to the third embodiment of the present invention.
As shown in FIG. 5, in the present embodiment, stepped portions (non-land adjustment portions) 14 rising upward are provided at the four corners of the upper surface 12T of the support frame portion 12S of the column 1T. The step portion 14 is formed in an L shape in plan view. In the present embodiment, for example, the rising height from the upper surface 12T of the support frame portion 12S of the stepped portion 14 is about 10 mm.

  In the joint structure between the column and the beam thus configured, for example, when the column 1T is slightly inclined due to an error or the like, the supporting concrete portion 13 protruding from the bottom surface 12Y of the recess 12Z is formed by the beam joint portion. 2, and the stepped portion 14 rising upward from the four corners of the upper surface 12 </ b> T of the support frame 12 </ b> S supports the cover plate 3. Therefore, the support concrete portion 13 and the stepped portion 14 can absorb the inclination of the column 1T and support the joint structure 2A in an appropriate posture.

(Fourth embodiment)
Next, a column / beam joint structure according to a fourth embodiment of the present invention will be described mainly with reference to FIGS. 6 and 7.

FIG. 6 is a perspective view showing a column to be joined in a joined structure of columns and beams according to the fourth embodiment of the present invention. FIG. 7 is a view corresponding to the AA cross-sectional view of FIG. 1 in the column-beam joint structure according to the fourth embodiment of the invention.
As shown in FIG.6 and FIG.7, in this embodiment, the width dimension of the support frame part 12V which protrudes upwards from the edge part of the upper surface 12Y of the column concrete part 12 is the width | variety of the support frame part 12S of 1st embodiment. Shorter than the dimensions. Further, the main bars 10, 10... Protrude from the upper surface of the column concrete portion 12 surrounded by the support frame portion 12V. A cover plate 3 is installed along the upper surface of the support frame portion 12V.

  Further, the edge wall portion 12W standing from the upper surface 12Y of the column concrete portion 12 in the support frame portion 12V is vertical so as to gradually approach the side surface of the column concrete portion 12 as it goes upward from the upper surface 12Y of the column concrete portion 12. Inclined with respect to the surface. Further, the central wall portion 13W standing from the upper surface 12Y of the column concrete portion 12 in the supporting concrete portion 13 is gradually separated from the facing edge wall portion 12W as it goes upward from the upper surface 12Y of the column concrete portion 12. Inclined with respect to the vertical plane. Forms (not shown) for forming the support frame portion 12V and the support concrete portion 13 are shaped to be easily removed from the mold, and corresponding edge wall portions 12W and central wall portions 13W face upward. Accordingly, the gaps are gradually separated from each other.

  In the structure of the column and beam connected in this way, the width dimension of the support frame portion 12V can be shortened as a configuration in which the load of the beam connection portion 2 is mainly supported by the support concrete portion 13. Further, even the support frame portion 12 </ b> V having a short width dimension functions as a mold frame of the joint concrete portion 4 together with the cover plate 3.

(Modification)
Next, a column-to-beam joint structure according to a modification of the second embodiment of the present invention will be described mainly with reference to FIG.
FIG. 8 is a perspective view showing a pillar to be joined in a joint structure of a pillar and a beam according to a modification of the second embodiment of the present invention.
As shown in FIG. 8, in this embodiment, the pillar 1U is constructed at a construction site. On the outer periphery of the column 1U, a mold 16 is assembled in a cylindrical shape having a square shape. The concrete column 12 is formed by placing concrete inside the mold 16.

  In addition, a cross-shaped upper mold frame 17 is provided on the upper surface of the pillar 1U. A through hole 17 </ b> X that penetrates in the vertical direction is formed in the center of the upper mold 17. On the lower surface of the upper mold 17, a four-sided frame 17 </ b> B that protrudes downward is provided around the through hole 17 </ b> X.

  In this pillar 1U, by placing concrete in the through hole 17X of the upper mold frame 17, a supporting concrete portion 13 (see FIG. 4) is formed in a portion surrounded by the four-sided frame 17B. The pillar 1U constructed at the construction site is less likely to have insufficient strength of the initial age after the concrete is cast than the pillar made of precast concrete, but the beam is joined by the support frame portion 12S and the support concrete portion 13 of the pillar 1U. Since the part 2 can be stably supported, the column 1U is not damaged by the load of the joint structure 2A. Moreover, the pillar 1U constructed at such a construction site is also joined to the joint structure 2A by the joint structure 100 of the pillar and the beam, similarly to the embodiment described above.

  It should be noted that the assembly procedure shown in the above-described embodiment, or the shapes and combinations of the constituent members are examples, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.

  For example, as a modification of the third embodiment described above, the pillar is not provided with a support portion, but a protruding portion that protrudes downward is provided on the lower surface of the beam. In this case, the protruding portion of the beam comes into contact with the bottom surface 12Y of the concave portion 12Z of the column, and the beam joint is supported by the column. Therefore, for example, when the column is slightly inclined, the bottom surface 12Y of the recess 12Z supports the protruding portion of the beam, and the stepped portion 14 rising upward from the four corners of the upper surface 12T of the support frame portion 12S is blocked. The plate 3 is supported. Therefore, the protruding portion and the step portion 14 can absorb the inclination of the column 1T and support the joint structure 2A in an appropriate posture.

1 ... Column 2 ... Beam joint (beam)
3 ... Fuzzer board (Fuzzer member)
4 ... Bonded concrete part 10 ... Main reinforcement 12 ... Column concrete part (concrete part)
12S ... support frame 12Z ... concave 13 ... support concrete part (support part)
14 ... Stepped part (non-land adjustment part)
100: Column-to-beam joint structure

Claims (3)

A reinforced concrete column having a concrete part, a main reinforcement extending in the vertical direction and projecting from the upper surface of the concrete part, and a steel structure beam,
A support frame portion protruding upward from the upper surface of the concrete portion and formed in a frame shape in plan view;
A cover member joined to the beam, supported by the support frame and formed to surround the main bar;
A joining structure of columns and beams, comprising: a joining concrete part filled from the inside of the support frame part to the inside of the blocking member.   The pillar-to-beam joint structure according to claim 1, further comprising a support portion that protrudes from an upper surface of the concrete portion and supports the beam.   3. The pillar-to-beam joint structure according to claim 1, wherein the support frame portion is formed with an uneven adjustment portion that rises upward and supports the blocking member. 4.

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