JP2001059266A - Joint structure between corner column and beam in tube frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the strength of a joint structure by arranging two corner columns such that corner portions of external reinforcements thereof are adjacent to each other, and attaching a horizontal reinforcement and a horizontal reinforcing bar of a PC beam end to the vertical reinforcements, to thereby form the joint. SOLUTION: Corner columns 1, 2 are arranged such that vertical reinforcements 3, 4 at respective corner portions of external reinforcements are adjacent to each other, and horizontal reinforcements 9, 10 protruding from precast concrete beams 7, 8 are inserted into the vertical reinforcements 3, 4 and tie hoops 5, 6, respectively, in the horizontal direction, followed by installing anchor portions 11, 12, respectively. Next, a trapezoidal horizontal reinforcing bar 13 is disposed across a recessed corner H of the corner portion, and both ends thereof are inserted into the vertical reinforcements 3, 4 and the tie hoops 5, 6, respectively. Then, concrete is placed at the joint to form a tie beam 16, to thereby joint the columns 1, 2 and the beams 7, 8 together. Alternatively, a horizontal reinforcing bar having an abacus bead shape as viewed horizontally is disposed across the recessed corner H and a projected corner, in the same manner. Thus, the cross section of the corner column can be efficiently enlarged and the toughness at the joint can be increased. Further, the construction efficiency can be improved to shorten the construction period.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a joint between a corner post and a beam of a tube frame in a super high-rise RC structure.

[0002]

2. Description of the Related Art In a high-rise building, the vertical load increases,
Therefore, restrictions on the plan are increased, for example, the column section becomes thicker, the number of columns increases, and the column interval decreases. Therefore, a tube structure is adopted in which all the pillars are arranged at the outer wall position and a horizontal force generated by an earthquake or wind is resisted as a structure like a birdcage.

[0003] The main skyscrapers in the world and in Japan adopt this tube structure. In order for this tube structure to be established, it is necessary to secure in-plane shear stiffness also in the horizontal plane and horizontal plane against horizontal force. If this is not ensured, the center of the orthogonal plane will not function effectively,
Stress concentrates on the corners. For this purpose, various measures have been taken to increase the structural surface by increasing the cross section of the columns or beams to increase the rigidity, or by providing braces.

For example, the tip of a conventional reinforcing bar is bent and fixed to the outside and corner pillars of a tube frame of a building in a super-high-rise RC structure in order to rationalize the arrangement of reinforcing bars at the joints between the columns and beams. As shown in FIG. 6, a filling-type plate fixing (rebar fixing) or the like has been used instead of the means for achieving the above. There are various methods for fixing the reinforcing bars of the columns and beams. FIG. 6 shows a method in which a fixing plate is screw-connected to a screw reinforcing bar and functions as an anchor so that the bending length of the reinforcing bars becomes unnecessary.

[0005]

However, as shown in the plan view of FIG. 1, the corner pillars of a super-high-rise RC tube frame of about 35 stories are very large in axial force such as tension and compression. A bending force and a shear force are applied, and in the cross-sectional design using only one column as shown in FIG. 6, in order to obtain the strength corresponding thereto, it is necessary to increase the diameter of the reinforcing bar and to reduce the amount of the reinforcing bar. However, there is a problem that the construction is extremely difficult. In addition, it was difficult to arrange the reinforcing bars of the lateral reinforcing bars for improving the toughness of the joint for the same reason.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a large tensile strength by arranging two corner pillars of a tube frame adjacent to each other and integrating the two pillars. , Compression force, etc., bending force and shear force. Furthermore, the beam and the like are made of precast, and only the joints are cast on site to achieve rationalization.

The present invention employs the following specific structure in order to solve the above problems. The corners of the outer rebar constituting each corner post are made adjacent to each other, and a horizontal streak projecting from the end of the precast beam is inserted between the vertical streaks of the corner post. A fixing portion such as a fixing plate is appropriately attached, and a horizontal reinforcing bar inserted and arranged between the vertical bars straddling each of the vertical bars forming the adjacent corner pillars is used as a joint. The structure of the joint between the corner post and the beam in the tube frame, which is characterized by being cast in a tube.

Further, the plane portions of the outer reinforcing bars constituting each corner post are made adjacent to each other, and a horizontal bar projecting from the end of the precast beam is inserted between the vertical bars of the corner post, and a part of the bar is inserted. At the tip, a fixing unit such as a fixing plate is attached as appropriate,
The other horizontal streaks are integrated with the horizontal streaks of the adjacent corner post, and the through bars are bent at the interconnecting portions constituting the corner post,
In addition, a hoop reinforcing bar is wound over the connecting portion-side vertical streak of one corner post and the connecting portion-side vertical streak of the other corner post to form a joint, and concrete is cast at the joint. The structure of the joint between the corner post and the beam in the tube frame, which is characterized by the following, is adopted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a joint between a corner post and a beam in a tube frame according to the present invention is shown in FIG. Structure A, B
Is the target. In the embodiment described below, the vertical streaks of the outer periphery constituting each corner post are arranged adjacent to each other, and the frameworks constituting the corner posts 1 and 2 and the beams 7 and 8 are integrated, whereby X An object of the present invention is to provide a joint capable of opposing seismic force in two directions, i.e., a direction and a Y direction.

[0010]

Embodiment 1 FIG. 2 is a plan view showing a structure A of a joint of a corner post in the plan view of FIG. 1, and particularly shows a structure of a joint on an upper floor.

Each of the corner posts 1 and 2 is arranged with the longitudinal bars at the corners of the outer rebar constituting the corner posts adjacent to each other. The normal vertical streaks 3 ... 4
.. And the hoops 5... 6 are assembled. Between the vertical bars 3, 4 and the hoop bars 5, 6, horizontal bars 9,..., 10 ... formed so as to project from the ends of the precast concrete beams 7, 8 from the lateral direction. insert. Therefore, the tip portions of the horizontal streaks 9 and 10 are located in the arrangement of the vertical streaks 3 and 4 of the pillar.

Fixing portions 11... 12 such as fixing plates are suitably attached to the distal ends of the horizontal streaks 9 and 10 by screw connection or the like. The fixing portions 11 and 12 are provided so that the reinforcing bar is not pulled out after the hardening of the concrete.
An appropriate shape and size having a sufficient anchor function is adopted. The horizontal streaks 9 and 10 and the fixing unit 1
By 1 and 12, the joint serves as an anchor for the main beam reinforcement.

Further, in order to integrate the corner pillars 1 and 2, reinforcing bars are arranged across the framework of the corner pillars 1 and 2. In this embodiment, the horizontal reinforcing bar 13 extends over the corner H of the corner.
Is composed. The horizontal reinforcing bar 13 is formed by three horizontal bars 14 and a hoop bar 15 connecting the horizontal bars 14 to each other, and surrounds two or three adjacent horizontal bars 14. 15 are entrained and have a generally trapezoidal trapezoidal shape, and both ends thereof are inserted and disposed between the vertical bars 3, 4 of the corner posts 1, 2 and the hoop bars 5, 6.

After assembling the vertical bars 3, 4, the bar bars 5, 6, the horizontal bars 9, 10, the fixing portions 11, 12, the horizontal reinforcing bars 13, etc., the periphery of the joint is appropriately formed with a mold or the like. And place concrete at the site.
By this casting in place, a triangular connecting beam 16 protruding into the corner H is formed, the corner pillars 1 and 2 and the beams 7 and 8 are integrated, and a structure A of a joint having a large cross-sectional shape is completed. I do.

Embodiment 2: FIG. 3 is similar to the embodiment of FIG.
FIG. 2 is a plan view showing a structure A of a joint portion of a corner post in the plan view of FIG. 1, particularly showing a structure of a joint portion on a lower floor.

Each of the corner posts 21 and 22 is disposed such that the vertical bars at the corners of the outer rebar constituting the corner posts are adjacent to each other. The normal vertical stripes 23
.., 24 ... and hoop muscles 25 ..., 26 ...
Is assembled. .., 30... Protruding from the ends of the precast concrete beams 27, 28 from the lateral direction between the vertical bars 23, 24 and the hoop bars 25, 26. insert. Therefore, the end portions of the horizontal streaks 29 and 30 are located in the reinforcing bars such as the vertical streaks 23 and 24 of the pillar.

Fixing portions 31,..., 32... Such as fixing plates are suitably attached to the distal ends of the horizontal streaks 29, 30 by screw connection or the like. As the fixing sections 31 and 32, those having an appropriate shape and size which sufficiently exert an anchor function so that the reinforcing bar is not pulled out after the hardening of the concrete is adopted. The horizontal streaks 29 and 30 and the fixing portions 31 and 32 serve to fix the main beam at the joint.

In order to integrate the corner posts 21 and 22, reinforcing bars are provided across the framework of the corner posts 21 and 22. In this embodiment, the horizontal reinforcing bars 33 and 34 are formed over both the entrance corner H and the exit corner I of the corner post.
The horizontal reinforcing bars 33 and 34 are formed of four horizontal bars and a hoop bar connecting the horizontal bars, and have a substantially abacus ball shape obtained by combining two equal-leg trapezoidal shapes as a whole. The part is formed by each of the vertical stripes 23, 24 of the corner posts 21, 22 and the hood.
It is inserted and arranged between the stitches 25 and 26.

The vertical streaks 23, 24, the hoop streaks 25, 2
6. After assembling the horizontal streaks 29, 30, the fixing portions 31, 32, and the horizontal reinforcing bars 33, 34, etc., the periphery of the joint is appropriately surrounded by a mold or the like, and a concrete is cast on site. By this casting in place, triangular connecting beams 35 and 36 projecting from both the entrance corner H and the exit corner I are formed, and the corner posts 21 and 22 and the beams 27 and 28 are integrated, and a large cross section is formed. The structure A of the joint having the shape is completed.

Embodiment 3 FIG. 4 is a plan view showing the structure B of the joint of the corner pillar in the plan view of FIG. 1, and particularly shows the structure of the joint on the upper floor.

Each corner post 41, 42 is arranged with the longitudinal bars of the plane portion of the outer reinforcing bar constituting the corner post adjacent to each other. In the corner pillars 41 and 42, normal vertical streaks 43
.., 44... And hoop muscles 45.
Is assembled. Between the vertical streaks 43, 44 and the hoop streaks 45, 46, horizontal streaks 49,..., 50,. insert.

Therefore, the tip portions of the horizontal streaks 49 and 50 are located in the arrangement of the vertical streaks 43 and 44 of the pillar.
In this embodiment, three horizontal streaks 49 on the beam 47 side and two horizontal streaks 50 on the other beam 48 side are shown.

A fixing portion 51 such as a fixing plate is suitably attached to the tip of a central horizontal streak 49 arranged on the beam 47 side by screw connection or the like, and the remaining two horizontal streaks 49 are connected to the beam 48 side. It is integrated with the horizontal streak 50 of the book by welding or the like, and the corner posts 41, 42
It is bent at the mutual connection part and is arranged as a through reinforcing bar.

A vertical streak 43 on the joint portion side of one corner post 41 is provided.
And the joint 44 on the other side of the corner post 42.
The reinforcing bar 52 is wound and reinforced. This hoop reinforcement 52
Thereby, the corner post 41 and the corner post 42 are integrated.

The vertical streaks 43 and 44, the hoop streaks 45 and 4
6. Lateral streaks 49, 50, anchoring section 51, and hoop reinforcing streaks 5
After the completion of assembling, etc., the periphery of the joint is appropriately surrounded by a mold or the like, and a concrete is cast on site. By this site casting, corner pillars 41 and 42 and beams 47,
48 are integrated with each other to complete a structure B having a large cross-section V-shaped bent portion bent to the corner H side.

Embodiment 4 FIG. 5 is similar to the embodiment of FIG.
FIG. 2 is a plan view showing a structure B portion of a joint between corner pillars in the plan view of FIG. 1, particularly showing a structure of a joint on a lower floor.

Each of the corner posts 61 and 62 is disposed such that the vertical bars of the plane portions of the outer reinforcing bars constituting the corner posts are adjacent to each other. The vertical pillars 63
.., 64 ... and hoop muscles 65 ..., 66 ...
Is assembled. .., 70... Formed between the vertical streaks 63, 64 and the hoop streaks 65, 66 from the ends of the precast concrete beams 67, 68. insert. Therefore, the distal ends of the horizontal streaks 69 and 70 are located in the arrangement of the vertical streaks 63 and 64 of the pillar.

In this embodiment, four lateral streaks 6 on the beam 67 side are used.
9 and two horizontal streaks 70 on the other beam 68 side are shown. A fixing portion 71 such as a fixing plate is appropriately attached to a distal end portion of two central horizontal streaks 69 arranged on the beam 67 side by screw connection or the like. On the other hand, the remaining two outer horizontal streaks 69 are integrated with the two horizontal streaks 70 on the beam 68 side by welding or the like, and are bent at the connecting portions of the corner posts 61 and 62 to form through reinforcing bars. .

A vertical streak 63 at the joint of one corner post 61 is also provided.
And the vertical streaks 64 of the other corner post 62 on the joint side.
The reinforcing bar 72 is wound and reinforced. This hoop reinforcement 72
Thereby, the corner pillar 61 and the corner pillar 62 are integrated.

The above-mentioned vertical streaks 63, 64 and hoop streaks 65, 6
6. Lateral streaks 69, 70, anchoring section 71, and hoop reinforcing bars 7.
After the completion of assembling, etc., the periphery of the joint is appropriately surrounded by a mold or the like, and a concrete is cast on site. By this casting in place, corner pillars 61 and 62 and beam 6
7 and 68 are integrated, and the structure B of the joint having a large cross section bent in the corner H side is completed.

[0031]

The structure of the joint between the corner post and the beam according to the present invention enables the cross section of the corner post to be efficiently enlarged, and a large number of pillar main bars can be arranged. Effective cross-sectional design has become possible.

Further, since the corner pillar is formed by two pillars corresponding to the X direction and the Y direction, the anchoring of the main reinforcement of the precast concrete beam attached to the corner pillar is improved.
Further, it has become possible to obtain a structure that is strong against seismic force in the direction of 45 degrees. Also, since only the corner pillars and the ends of the beams can be constructed as joints cast in place, the beams can be precast and the construction period can be shortened.

Furthermore, since it is possible to arrange the reinforcing bars,
It is easy to increase the toughness of the joint, and since the filling type screw fixing is used for fixing the main reinforcement of the precast concrete beam, labor is saved in the arrangement of the reinforcement.

[Brief description of the drawings]

FIG. 1 is a plan view showing a position of a joint between a corner post and a beam according to the present invention.

FIG. 2 is a sectional view showing a structure of a joint between a corner post and a beam on an upper floor of the present invention.

FIG. 3 is a cross-sectional view showing a structure of a joint between a corner post and a beam on a lower floor according to the present invention.

FIG. 4 is a cross-sectional view showing a structure of a joint between a corner post and a beam on an upper floor of the present invention.

FIG. 5 is a cross-sectional view showing a structure of a joint between a corner post and a beam on a lower floor according to the present invention.

FIG. 6 is a sectional view of a conventional example showing a structure of a joint between a corner post and a beam.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corner pillar 2 Corner pillar 3 Vertical streak 4 Longitudinal streak 5 Hoop streak 6 Hoop streak 7 Beam 8 Beam 9 Horizontal streak 10 Horizontal streak 11 Anchoring part 12 Anchoring part 13 Horizontal reinforcement 14 Horizontal streak 15 Hoop 16 Connecting Beam 21 Corner post 22 Corner post 23 Vertical streak 24 Vertical streak 25 Hoop streak 26 Hoop streak 27 Beam 28 Beam 29 Lateral streak 30 Lateral streak 31 Fixing part 32 Fixing part 33 Reinforcing bar 34 Reinforcing bar 35 Connecting beam 36 Connecting beam 41 Corner pillar 42 corner pillar 43 vertical streak 44 vertical streak 45 hoop streak 46 hoop streak 47 beam 48 beam 49 horizontal streak 50 horizontal streak 51 anchoring part 52 hoop reinforcement 61 corner post 62 corner post 63 vertical streak 64 vertical streak 65 hoop streak 66 hoop streak 67 beam 68 beam 69 horizontal streak 70 horizontal streak 71 hoop streak 72 hoop streak

Claims (5)

[Claims] 1. A precast concrete beam to be attached to each corner post, wherein a corner portion of the tube frame is constituted by two corner posts, and corner portions of an outer reinforcing bar forming the corner post are adjacent to each other. Insert the horizontal streak protruding from the end between the vertical streaks of the corner post and attach the anchoring member to the tip, and attach the horizontal reinforcing bar that straddles the vertical streaks of the adjacent corner post and is inserted and placed between the vertical streaks A joint between a corner post and a beam in a tube frame, characterized in that a concrete is cast into the joint. 2. The corner post in a tube frame according to claim 1, wherein the horizontal reinforcing bars are formed by a plurality of horizontal bars and hoop bars connecting the horizontal bars. Structure of the joint with the beam. 3. An equilateral trapezoidal horizontal reinforcing bar is attached to an entry corner formed by an adjacent corner post over a vertical bar of the adjacent corner post. Item 3. A structure of a joint between a corner post and a beam in the tube frame according to Item 2. 4. An abacus ball-shaped horizontal reinforcing bar is attached to both the entrance corner and the exit corner formed by the adjacent corner post over the vertical line of the adjacent corner post. 3. The structure of a joint between a corner post and a beam in the tube frame according to claim 1 or 2. 5. An end of a precast concrete beam attached to each corner post, wherein the corner portion of the tube frame is constituted by two corner posts, and the flat portions of the outer reinforcing bars forming the corner post are adjacent to each other. The horizontal bars protruding from the part are inserted between the vertical bars of the corner pillars, the anchoring member is attached to the tip of one of the horizontal bars protruding from one of the precast concrete beams, and the remaining reinforcing bars are attached to the other precast concrete beam. The horizontal bars projecting from the girder are integrated with each other to form a through-bar that is bent at the connecting portions of the corner pillars that constitute the corners, and the vertical bars on the connecting portion side of one corner post and the other connecting portion side A joint between a corner post and a beam in a tube frame characterized by forming a joint by winding a hoop reinforcing bar over a vertical bar, and casting a concrete at the joint. Structure.