JPH07279244A - Joint construction between column and beam in multi-story building - Google Patents

Abstract

PURPOSE:To obtain simple joint construction between a column and a beam and high quality of executed construction and, at the same time, to obtain joint construction between column and beam in a multi-story building suitable also for a high-rise building. CONSTITUTION:In joint construction between a column and a beam in a multi- story building consisting of floors overlapping a floor constructed by extending a beam in the X direction in a span with a floor constructed by extending a beam in the Y direction in a span alternately, steel encased reinforced concrete columns 5 of cast-in-place concrete are used. In each floor, precast steel encased reinforced concrete beams 1 constructed by connecting beam structural steel materials 2 to column structural steel materials 6 of the steel encased reinforced concrete columns 5 are used as structural members. The column structural steel materials 6 are formed in an H-shaped horizontal section in every floor, and their flange positions are so arranged that they are correspondent with the extended direction of X or Y of the precast steel encased reinforced concrete beams 1 in the floor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure of columns and beams in a multi-story building.

[0002]

2. Description of the Related Art Conventionally, there has been known an SRC construction structure in which a steel aggregate is embedded in concrete columns and beams. The steel aggregate embedded in the concrete columns of this building structure is usually a steel material having a cross-shaped cross section in which a web extends in four directions in the X direction and the Y direction orthogonal to the X direction. .

At the joints between the columns and the beams in each layer, the steel frames of four beams extending in the X direction and the Y direction are fixed to the web of the column steel material having a cross-shaped cross section, respectively. A joint is obtained by pouring concrete. However, the above-mentioned joining portion has a complicated joining structure in which four beam steel members are fixed to a column steel member having a cross-shaped cross section, and further, column reinforcing bars and beam reinforcing bars are arranged around the fixing portion, However, there was a problem in the joint of the beam main bars of the precast steel-framed reinforced concrete beams that gathered in the columns from all sides, and there was a possibility that the concrete could not be filled reliably, and there was a problem in terms of construction efficiency and construction quality.

Therefore, as a building structure in which a simple joint structure of a column and a beam can be obtained and the structural stability is improved, Japanese Patent Laid-Open Publication No. Hei 4 (1998)
A multi-story building shown in Japanese Patent Publication No. 347233 is known. In this multi-story building, a sill-type or ten-type column-beam composite member is erected in one layer in the X-direction, and a floor plate is laid in the Y-direction between the beams of each of the sac-type or ten-type column-beam composite members. The structure is formed by alternately stacking a layer and a layer in which a floorboard is bridged in the X direction between beam members installed in the Y direction between the column heads of the beam / column composite member.

As a result, the frame is assembled by the beams extending in only one direction (for example, the X direction) for each layer, so that in each layer, the beam joints in only one direction are joined to the column joints. Becomes

[0006]

However, since the multi-story building of Japanese Patent Laid-Open No. 4-347233 employs columns and beams of reinforced concrete structure, long-term loads such as loading and fixing loads, seismic loads, etc. To construct a structure that can withstand short-term loads such as, the building must be constructed as columns and beams with a large cross-section and a certain amount of rebar.

Therefore, since a large number of column reinforcing bars and beam reinforcing bars are arranged so as to intersect at the joint where the concrete is poured, as in the above-mentioned SRC building structure, the concrete is poured into the joint. There is a problem in terms of concrete filling. Also,
Due to the large cross section of columns and beams, it cannot be easily applied to the construction of high-rise buildings.

The present invention has been made in view of the above circumstances, and a pillar and a beam in a multi-story building which is suitable for the construction of a high-rise building as well as a simple joint and a high-quality construction structure can be obtained. It is intended to provide a joint structure of.

[0009]

According to a first aspect of the present invention, there is provided a structure in which a pillar and a beam are joined to each other in a multi-story building. The structure has a structure in which beams are extended in the Y direction different from the X direction and the layers are laid alternately, and the structure is made by alternately stacking concrete, and a steel frame reinforced concrete column in which concrete is cast by cast-in-place, and the steel frame reinforced concrete column in each layer The pre-cast steel-framed reinforced concrete beam in which the beam steel-framed structure is connected to the column steel frame-structured structure is installed as a constituent member. The column steel aggregate is arranged such that the horizontal cross-sectional shape in each layer is H-shaped, and the flange position thereof is aligned with the extending direction of the precast steel-framed reinforced concrete beam of the layer in the X direction or the Y direction. The structure is characterized by

According to a second aspect of the present invention, in the structure according to the first aspect, the beam steel aggregate is made of H-shaped steel,
The structure is characterized in that the H-shaped steel web and the flange of the column steel aggregate are connected. Further, the structure according to claim 3 is the same as the structure according to claim 1 or 2,
At least two pillar steel aggregates extending vertically from the floor to the n-1 floor below the n floor or the n + 1 floor above the floor are different in flange position alternately in the X direction or the Y direction for each floor. It is a structure characterized in that it is made of H-section steel.

According to a fourth aspect of the present invention, in the structure according to the second or third aspect, the joint plate projecting outward from the flange of the pillar iron aggregate and the web of the beam iron aggregate are provided. The structure is characterized in that they are connected in a surface contact state. Furthermore, the structure according to claim 5 is the structure according to claim 4, characterized in that the joint plate and the web of the beam steel aggregate are connected by bolt fastening means.

[0012]

According to the joint structure of columns and beams in a multi-story building according to claim 1 of the present invention, since the beams are arranged only in the X direction or the Y direction by the precast steel-framed reinforced concrete beams, The beam reinforcement extending to the beam joint position has a small amount of reinforcement only in the X direction or the Y direction, and the column steel aggregate at the joint position is in the same direction as the beam extending direction, that is, the X direction or the Y direction. Since it has an H-shape with a flange placed only on the structure, there are few crossovers of the reinforcing bars at the joint positions of the columns and beams, and the area occupied by the column steel aggregate at those joint positions is also small, so the site Concrete is surely filled in the joint position by pouring concrete, and there is no problem in terms of construction efficiency and construction quality.

Further, the use of the precast steel-framed reinforced concrete beams does not increase the amount of beam reinforcements such as the upper and lower reinforcements and also reduces the cross-sectional size of the beam, so that the weight of the constituent members can be reduced and the high-rise building can be constructed. A suitable column-beam joint structure is obtained. Further, according to the joining structure of claim 2,
In addition to the effect of the first aspect being obtained, the weight of the beam can be further reduced, and the beam iron aggregate and the column iron aggregate of the H-shaped shapes can be easily connected.

According to the joint structure of the pillar and the beam described in claim 3, the action described in claim 2 can be obtained, and at the joint position, a horizontal cross-sectional H-shape can be obtained, and the structural strength between the layers can be obtained. Since the cross-shaped pillar steel aggregate having a horizontal cross-section is formed using the existing H-shaped steel, the construction cost can be reduced. Further, according to the joint structure of claim 4, the effect of claim 2 or 3 is obtained, and the joint plate provided on the flange of the pillar iron aggregate and the web of the beam iron aggregate are connected in a surface contact state. As a result, the steel reinforced concrete columns reliably support the loads of the precast steel reinforced concrete beams.

Further, according to the joint structure of the fifth aspect, the action of the fourth aspect can be obtained, and the work of connecting the column iron aggregate and the beam iron aggregate can be facilitated, and the construction efficiency can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a joint structure of columns and beams in a multi-story building according to the present invention will be described in detail below with reference to FIGS. What is shown in FIGS. 1 (a) and 1 (b) is
It is a precast steel-framed reinforced concrete beam (hereinafter abbreviated as SPC beam) 1 used in this example.

In this SPC beam 1, an H-shaped steel (hereinafter abbreviated as H-shaped steel for a beam) 2 is embedded in a concrete beam 1a, and a lower end streak 1b is embedded along the longitudinal direction on the lower side. It is a precast beam in which the upper end streak 1d extends in the longitudinal direction and engages with the stirrup 1c ... Projecting from the upper surface of the beam 1a. And H-shaped steel for beams 2
The lower flange 2a and the web 2b are inside the concrete beam 1a, and the upper flange 2c is the concrete beam 1a.
An end portion in the longitudinal direction projects from the concrete beam 1a while being buried in a state substantially flush with the upper surface of a. The protruding web 2b of the H-shaped beam steel 2 is provided with a plurality of bolt holes 2e used when bolting to a post steel frame, which will be described later.

Both ends of the lower end streak 1b extend in parallel with the beam H-shaped steel 2 and further project from the end face of the concrete beam 1a. Then, the end portion of the lower end streak 1b is connected to the other SPC beam 1 by the joint metal fitting 3 by the screw joint method.
The lower end streak 1b is joined. As shown in FIGS. 2 (a), (b), and (c), the SPC beam 1 having the above-described structure is installed between columns 5 and 5 so as to extend in the X direction on the n-1 floor (see FIG. 2 (c)), on the nth floor, it is erected between the pillars 5 and 5 so as to extend in the Y direction orthogonal to the X direction (see FIG. 2B), and on the (n + 1) th floor, X
It is installed between columns 5 and 5 so as to extend in the direction (Fig. 2
(See (a)), that is, a multi-story building is constructed by a multi-layer structure in which the extending direction of the SPC beam 1 is different for each floor. In addition, the code | symbol 13 in the figure is a floor slab formed by pouring the cast-in-place concrete.

Here, the column 5 is a steel reinforced concrete column (hereinafter referred to as SRC) formed by cast-in-place concrete.
It is abbreviated as a pillar. ), And H-section steel (hereinafter abbreviated as H-section steel for columns) 6 is used as the steel aggregate of the SRC column 5. As shown in FIG. 3, in the H-shaped steel 6 for pillars that vertically extends over three floors from the n-1th floor to the n + 1th floor, members vertically adjacent to each other have a web surface direction of 90 degrees relative to each other. It is composed of three short H-shaped steels 6A, 6B and 6C which are connected differently.

That is, in the H-section steel 6A at the joining position with the SPC beam 1 on the (n-1) th floor, the surface direction of the web 6Aa is S.
It is arranged so as to extend in the same direction (X direction) as the surface direction of the web 2b of the PC beam 1. And this H-shaped steel 6
In the upper part of A, H which is inverted 90 degrees about the axis
The shaped steel 6B is coupled so that the webs 6Aa and 6Ba are polymerized with each other to form a cross shape (see FIG. 4).

Further, in the H-section steel 6B at the joining position with the n-th floor SPC beam 1, the surface direction of the web 6Ba is SPC beam 1.
Is arranged so as to extend in the same direction (Y direction) as the surface direction of the web 2b. Then, an H-shaped steel 6C, which is inverted by 90 degrees about its axis, is connected to the upper portion of the H-shaped steel 6B so that the webs 6Ba and 6Ca are polymerized to form a cross-shaped cross section.

Further, in the H-section steel 6C at the joining position with the SPC beam 1 on the (n + 1) th floor, the surface direction of the web 6Ca is SP.
It is arranged so as to extend in the same direction (X direction) as the surface direction of the web 2b of the C-beam 1. Then, the beam H-shaped steel 2 and the column H-shaped steels 6A, 6B, 6C at the joining positions of the respective floors
Has the following structure.

That is, as shown in FIG. 3, the joint plates 8 are fixed by welding to the outer surfaces of the flanges 6Ab and 6Ac of the H-shaped steel 6A located in the (n-1) th hierarchy. Further, a plurality of bolt holes 8a corresponding to the bolt holes 2e provided in the beam H-shaped steel 2 of the SPC beam 1 are bored in these joint plates 8. And the bolt hole 2
One side of the web 2b of the H-shaped steel 2 for beams is brought into contact with the joining plate 8 so as to be in surface contact with the corresponding e and 8a, and bolts are inserted into the respective bolt holes 2e and 8a and fastened with nuts. By doing so, H-shaped steel 6A and SPC beam 1
, And the SPC beam 1 is erected on the H-shaped steel 6A for columns. Reference numeral 10 shown in FIG. 3 indicates the flange surfaces 2a and 2c of the H-shaped steel 2 for beams, and the flange 6Ab of the H-shaped steel 6 for columns.
6Ac (6Bb, 6Bc, 6Cb, 6Cc) is a welded portion which is locally fixed. A plurality of column main reinforcements 9a extending in the vertical direction are provided around the column H-shaped steel 6, and hoop reinforcements 9b are provided around these column main reinforcements 9a.

As a result, as shown in FIG.
The flanges 6Ab and 6Ac of A are arranged so as to extend in the X direction which is the same direction as the SPC beam 1. In addition, H-shaped steel 6C and S
The PC beams 1 are also connected by the structure described above. Also,
In the joint structure of the H-shaped steel 6B and the SPC beam 1, as shown in FIG. 6, the flanges 6Bb and 6Bc of the H-shaped steel 6A have the SPC beam 1.
It is arranged so as to extend in the Y direction, which is the same direction as.

As shown in FIG. 7, the H-section steel 6B in FIG. 3 has flanges 6Bb and 6Bc arranged in the Y direction. Further, as shown in FIG. 8, the H-section steel 6C in FIG. 3 has the flanges 6Cb and 6Cc arranged in the X direction. Then, the column H having the above structure
Assembling a frame material (not shown) around the shaped steel 6, SPC beam 1
By assembling the floor material between the floors, and by pouring concrete into the part surrounded by the chain double-dashed line shown in FIG. 3 by in-situ casting, as shown in FIG. 9, n-1 floor, n floor, n + 1 The stirrup 1c and the upper end streak 1d of the floor are fixed in the concrete to form the concrete floor slab 13, and the H-shaped steel for column 6, the lower end streak 1b, the column main bar 9a and the hoop streak 9b are fixed in the concrete. The SRC pillar 5 is formed to build a multi-story building.

Next, the operation of the joint structure of columns and beams in the multi-story building having the above-mentioned structure will be described. First,
In the present embodiment, since the beam is constituted by the SPC beam 1, the amount of reinforcement of the beam reinforcing bars (the lower end bar 1b, the upper end bar 1d, etc.) extending to the joint position between the column and the beam is reduced, and As shown in FIGS. 4 and 5, the column steel aggregate at the joining position has the same direction as the extending direction of the SPC beam 1, that is, X
Since the H-section steels 6A, 6B, and 6C have the flanges arranged only in the Y direction or in the Y direction, the crossover portions of the reinforcing bars at the joint positions of the columns and the beams are reduced. Furthermore, since the area occupied by the column steel aggregate at the joining position is also small, in this embodiment, even if concrete is cast by in-situ casting, the joining position is reliably filled with concrete, and the construction efficiency and construction quality are improved. It is possible to obtain a joint structure of columns and beams with no problem in terms of surface.

Secondly, the use of the SPC beam 1 does not increase the amount of beam reinforcement such as the bottom reinforcement and also reduces the cross-sectional size of the beam, so that the weight of the constituent members can be reduced and a high-rise building can be obtained. A suitable column-beam joint structure can be obtained. Third
In addition, since the H-shaped steel 6 for pillars is composed of a plurality of short H-shaped steels 6A, 6B, 6C in which members vertically adjacent to each other are connected by making the surface directions of the webs different from each other by 90 degrees, An H-shaped horizontal cross section can be obtained at the joining position of a predetermined level, and a horizontal cross shape with increased structural strength can be provided between the levels, so that the construction cost can be reduced.

Fourthly, since the joining plate 8 provided on each flange of the H-shaped steel 6 for columns and the web 2b of the H-shaped steel 2 for beams of the SPC beam 1 are connected in a surface contact state, the SRC column 5 Can reliably support the load of the SPC beam 1.
Fifth, the joining plate 8 and the web 2b of the H-shaped steel 2 for beams
Since they are connected by a bolt fastening means which is easy to work, the construction efficiency can be greatly improved.

In this embodiment, as shown in FIG. 1, the lower end streaks 1b of the adjacent SPC beams 1 and 1 are joined by the joining metal fitting 3 by the screw joint method, but it is not limited to this. However, they may be joined by pressure welding or enclosed welding. In addition, adjacent SPC
A structure in which the lower end bars 1b of the beams 1 and 1 are not joined to each other, and the end portion 1e of the lower end bar 1b is bent upward as shown in FIG. May be

[0030]

As described above, in the joint structure of columns and beams in the multi-storey building according to claim 1 of the present invention, the beams are arranged only in the X direction or the Y direction by the precast steel frame reinforced concrete beams. Therefore, the beam reinforcement extending to the joint position of the column and the beam has a small amount of bar arrangement only in the X direction or the Y direction, and the column steel aggregate at the joint position has the same direction as the extending direction of the beam. That is, since it has an H-shape with flanges arranged only in the X direction or the Y direction, there are few intersecting portions of reinforcing bars at the joint positions of columns and beams, and there is also a small area occupied by the column steel aggregate at the joint positions. Becomes As a result, the present invention makes it possible to obtain a column-beam joint structure in which concrete is reliably filled in the joint position even if the concrete is cast by in-situ casting, and there is no problem in terms of construction efficiency and construction quality. .

Further, the use of precast steel-framed reinforced concrete beams does not increase the amount of beam reinforcements such as the upper and lower reinforcements, and also reduces the cross-sectional size of the beam, thus reducing the weight of the structural members and increasing the height of the building. It is possible to obtain a preferable column-beam joint structure. In addition to the effect of claim 1, the joint structure of the pillar and the beam in the multi-story building according to claim 2 can further reduce the weight of the beam, and the beam steel aggregate having H-shaped shapes. It is possible to easily connect the column and the steel frame aggregate.

In addition to the effect of claim 2, the joint structure of columns and beams in a multi-story building according to claim 3
A horizontal cross-section H-shape is obtained at the joining position, and the cross-shaped horizontal cross-section pillar steel aggregate that increases the structural strength between layers is made of existing H-section steel, so the construction cost should be reduced. You can Further, in addition to the effect of claim 2 or 3, the joint structure of a pillar and a beam in a multi-story building according to claim 4 includes a joint plate provided on a flange of a pillar iron aggregate and a web of the beam iron aggregate. Since they are connected in a surface contact state, the steel-framed reinforced concrete column can reliably support the load of the precast steel-framed reinforced concrete beam.

Further, in the joint structure of the pillar and the beam in the multi-story building according to the fifth aspect, in addition to the effect of the fourth aspect, the work of connecting the column iron aggregate and the beam iron aggregate can be facilitated. The construction efficiency can be greatly improved.

[Brief description of drawings]

FIG. 1 is a view showing a precast steel-framed reinforced concrete beam according to the present invention, in which (a) is a front view and (b) is a side view.

FIG. 2 is a diagram showing an arrangement direction on each floor of a precast steel-framed reinforced concrete beam installed on a steel-framed reinforced concrete column according to the present invention.

FIG. 3 is a diagram showing a joint structure of steel frame reinforced concrete columns and precast steel frame reinforced concrete beams of the (n-1) th layer to the (n + 1) th layer of the present invention.

FIG. 4 is a view taken along the line IV-IV in FIG.

5 is a view taken along the line VV in FIG.

6 is a view taken along the line VI-VI in FIG.

FIG. 7 is a view taken along the line VII-VII in FIG.

FIG. 8 is a view taken along the line VIII-VIII in FIG.

FIG. 9 is a view showing a structure of a multi-layer building according to the present invention.

FIG. 10 is a front view showing another embodiment of the precast steel-framed reinforced concrete beam according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Precast steel reinforced concrete beam 1b Lower end reinforcement 2 Beam steel aggregate 2a, 2c Flange 2b web 5 Steel frame reinforced concrete column 6, 6A, 6B, 6C Column steel aggregate 6Aa, 6Ba, 6Ca Web 6Ab, 6Ac, 6Bb, 6Bc, 6Cb, 6Cc flange

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takanori Isaka 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (5)

[Claims] 1. A layer in which a beam is laid between columns to extend in the X direction and a layer in which a beam is laid between columns to extend in a Y direction different from the X direction are alternately laminated. It is a joint structure of columns and beams in a multi-story building, in which concrete is placed by cast-in-place and steel-framed reinforced concrete columns are erected by connecting the beam steel aggregates to the column steel aggregates of the steel-framed reinforced concrete columns in each layer. A precast steel-framed reinforced concrete beam as a constituent member, and the column steel-framed member has an H-shaped horizontal cross-sectional shape in each layer, and its flange position is in the X direction or Y of the precast steel-framed reinforced concrete beam of the layer. The joint structure of columns and beams in a multi-story building, which is characterized in that it is arranged in line with the extension direction of the direction. 2. The pillar and beam of a multi-story building according to claim 1, wherein the beam steel aggregate is made of H-shaped steel, and the web of the H-shaped steel and the flange of the column steel aggregate are connected to each other. Junction structure. 3. The n-1 below the nth layer and below the nth layer
The column steel aggregate extending vertically to the upper level or the upper (n + 1) level is composed of at least two H-shaped steels whose flange positions are alternately different in the X direction or the Y direction for each level. The joint structure of a pillar and a beam in the multi-story building according to claim 1 or 2. 4. The joint plate projecting outward from the flange of the column steel aggregate and the web of the beam steel aggregate are connected in surface contact with each other. Connection structure of columns and beams in the described multi-story building. 5. The column-beam joint structure in a multi-story structure according to claim 4, wherein the joint plate and the web of the beam steel aggregate are connected by bolt fastening means.