JP2017066846A - Column-beam frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a column-beam frame capable of securing a living room of a large space.SOLUTION: A column-beam frame 1 comprises a plurality of columns, a plurality of girders and a slab connected to the girders, and is provided in a reinforced-concrete building 2 of not supporting a central part of the slab by the columns. The column-beam frame 1 comprises the plurality of columns 10A and 10B juxtaposed in two rows in the predetermined direction, the first girders 20A and 20B of two rows installed between the mutual columns, a beam 30 installed between the mutual first girders 20A and 20B and the slab 40 joined to a lower part side surface of the beam 30. Both end parts of the slab 40 are joined to the first girders 20A and 20B of separating by 2 spans in a column-spacing distance.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a column beam structure for constructing a large room on the first floor or intermediate floor of a building, for example.

Buildings are required to secure large spaces so that they can be used for a wide range of purposes. Furthermore, in recent years, in order to improve the living environment, there is a demand for a large space where outside light and natural wind can be taken deep inside the building.
Therefore, it is conceivable to reduce the column size and further increase the interval (span length) between adjacent columns. As a method of extending the span, it has been performed to use high-strength concrete for the columns, or to use prestressed concrete beams or steel beams having excellent bending rigidity for the large beams installed between the columns.

  For example, Patent Document 1 discloses a precast beam member in which a beam portion and a panel portion placed on an upper surface of a column are integrated. According to the beam member of Patent Document 1, a column beam frame can be efficiently constructed.

  Patent Document 2 discloses a reverse beam method in which a precast concrete beam is installed between the tops of columns. This precast concrete beam is a reverse beam with a slab in which slabs are provided at the lower ends of both side surfaces of the beam. In a general reinforced concrete building, a reverse beam is a beam in which a slab is joined to the lower end side of the beam, whereas a slab is joined to the upper end side of the beam.

In the building of Patent Document 2, a balcony is provided along the longitudinal direction of the building, and a reverse beam with a slab is used for this balcony. Also, reverse beams with slabs are used in the short direction of the building. In the short direction of the building, a door wall is provided for each span.
According to the building of patent document 2, a high quality beam with a slab can be constructed in a short period of time by using a precast concrete beam.

Japanese Patent No. 5602455 Japanese Patent Laid-Open No. 11-50527

  However, in the building of Patent Document 2, it is necessary to arrange the door wall with a short span, so it was impossible to secure a large room.

  An object of this invention is to provide the column beam frame which can ensure the living room of large space.

  A column beam frame of the first invention (for example, a column beam frame 1 described later) includes a plurality of columns, a plurality of large beams, and a slab connected to the large beam, and a central portion of the slab is a column. A plurality of columns (for example, columns 10A and 10B described later) provided in a column-and-frame structure of an unsupported reinforced concrete building (for example, building 2 described later) and arranged in at least two rows in a predetermined direction; At least two rows of first large beams (for example, large beams 20A and 20B described later) laid between the columns and small beams (for example, small beams described later) laid between the first large beams. 30) and a slab (for example, a slab 40 described later) joined to the lower side surface of the beam, and the both ends of the beam-attached slab have a distance between columns of 2 spans or more. It is characterized by being joined to a large beam.

  According to 1st invention, the slab with a small beam of a reverse beam type was constructed between the 1st large beams separated by 2 spans or more. The slab bends downward with a peak near the center of the slab due to the slab's own weight and the load on the slab. This part (effective slab width) resists bending together with the small beam. That is, bending rigidity is increased by adding a slab to the beam. Therefore, the vertical deflection generated in the slab can be reduced. By joining the slab to the lower part of the beam, the reinforcing bars and concrete within the effective slab width play a major role in increasing the bending stiffness. Therefore, it is not necessary to provide a column on the lower surface of the slab, and a portion directly below the slab with a small beam can be used as a large room.

  In the column beam frame of the second invention, the small beam is a precast prestressed concrete structure in which tension is introduced, and a second large beam (for example, a second beam described later) provided adjacent to the small beam. It has a longer span than that of the large beam 20C).

  The girder is a main structural member that resists horizontal seismic force at the time of the earthquake, and it is necessary to construct a strong column beam structure with the girder and the column by erection on the top of adjacent columns. However, the small beam, which is an auxiliary member of the large beam, is not the main structural member that resists horizontal seismic force. Therefore, the small beam is directly mounted on the column member, and both are firmly joined to form the column beam structure. There is no need.

Therefore, according to the second invention, the tension force introduced into the prestressed concrete beam is curved so as to bulge upward (turning), so that the slab's own weight and load capacity can be obtained. The amount of vertical deformation of the slab generated by the above can be offset and reduced.
In addition, the small beam is made of prestressed concrete, so it is a structure with excellent bending rigidity and strength, but it is not necessary to bear the horizontal seismic force. realizable. Furthermore, the beam length (beam height) can be lowered, and the small beam can be stored in the underfloor space of the double floor. Moreover, even if the small beam has a long span, the occurrence of creep and cracks can be prevented.

  According to a third aspect of the present invention, the first beam and the second beam constituting the outer periphery of the building are provided inside the outer periphery of the building (for example, exterior glass 60 described later), and the building of the beam The slab is joined to the lower side surface on the inner side, and a cantilever slab (for example, a cantilever slab 50 to be described later) is joined to the upper side surface of the girder outside the building.

  According to the third invention, there is no large beam on the outer peripheral surface of the building, so by providing a large daylighting window at the tip of the cantilevered slab, a large daylighting area is secured and outside light is easily taken into the building. be able to.

  In the column beam frame according to the fourth aspect of the present invention, a concave portion (for example, a concave portion 31 described later) is formed in the lower side surface of the small beam along the length direction, and the side surface of the slab to be joined to the small beam is formed. Is formed with an engaging portion (for example, an engaging portion 41 described later) that engages with the concave portion.

  According to the invention of the fourth aspect, since the engaging portion of the slab is engaged with the concave portion of the small beam, the small beam and the slab are firmly integrated with the geometrical engagement effect by the shear key. It becomes a slab. Therefore, even if the small beam and the slab are bent in the vertical direction by their own weight, the slab can be reliably supported by the small beam.

  According to the present invention, it is possible to construct a large space living room on the first floor or intermediate floor of a building without providing a column on the lower surface of the slab, and a reverse beam type of small beam excellent in resistance to bending moment. A column beam structure with a slab can be realized.

It is a top view of a building provided with a column beam frame concerning one embodiment of the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is sectional drawing which shows the junction part of the small beam and slab in the column beam frame which concerns on the said embodiment. It is an expanded sectional view of the small beam in the column beam frame concerning the embodiment. It is sectional drawing of the underfloor space in the column beam frame which concerns on the said embodiment. It is a flowchart of the procedure which builds the column beam frame which concerns on the said embodiment. It is a drawing substitute photograph which shows the installation situation of the small beam which comprises the column beam frame which concerns on the said embodiment. It is sectional drawing which shows the junction part of the small beam and slab which concern on the 1st modification of this invention. It is sectional drawing which shows the junction part of the small beam and slab which concern on the 2nd modification of this invention. It is sectional drawing which shows the junction part of the small beam and slab which concern on the 3rd modification of this invention. It is sectional drawing which shows the junction part of the small beam and slab which concern on the 4th modification of this invention.

The present inventors, as a column beam structure capable of forming a large space room on the first floor or intermediate floor of a building, have a plurality of columns, a plurality of large beams, and a large beam in which the distance between opposing columns is 2 spans or more apart. Between,
Focusing on the fact that a large space room can be constructed without providing a column on the lower surface of the slab by providing a prestressed concrete reverse beam type beam and a slab with a beam that integrates the slab. The present invention of the frame was reached.
The column beam frame according to the embodiment includes a plurality of columns arranged in two or more rows, at least two rows of large beams, and a reverse beam type slab with a small beam constructed between two opposed large beams separated by two spans or more. And comprising. The feature of the present invention is that the small beam is a precast prestressed concrete member and has a longer span than the second large beam arranged in parallel with the small beam.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view of a building 2 including a column beam frame 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 3 is a cross-sectional view taken along line BB in FIG.

  The building 2 is made of reinforced concrete and has a column beam frame 1. The column beam frame 1 includes columns 10A and 10B, large beams 20A and 20B as first large beams, large beams 20C as second large beams, small beams 30, a slab 40, and a cantilever slab 50.

The pillars 10A and 10B are provided in two rows in a predetermined direction. Specifically, one row (upper row in FIG. 1) is composed of pillars 10A, and the other row (lower row in FIG. 1) is composed of columns 10B. Each column is provided with three columns 10A and 10B.
A column 10C is provided between the column 10A located at both ends of one row and the column 10B located at both ends of the other row.

The large beams 20A, 20B, and 20C are installed between the columns 10A and 10B in each row. These large beams 20 </ b> A to 20 </ b> C are arranged along the outer periphery of the building 2.
Among these, the first large beam 20A extends in a predetermined direction and is installed between the columns 10A.
The first large beam 20B extends in a predetermined direction and is laid between the columns 10B.
Further, the second large beam 20C extends in a direction intersecting with a predetermined direction and extends between the columns 10A and 10C located at both ends of one row and between the columns 10B and 10C located at both ends of the other row. It is erected between.
As described above, the first large beams 20A and 20B are arranged 2 spans apart in a direction intersecting the predetermined direction.

  The small beam 30 is constructed between the first large beam 20A and the first large beam 20B. The small beam 30 is a precast member into which a pretension type prestress (tensile force) is introduced, that is, a precast prestressed concrete beam (hereinafter referred to as a PCaPC beam). The small beam 30 has a longer span than the second large beam 20 </ b> C provided adjacent to the small beam 30.

The slab 40 is provided in a portion surrounded by the first large beams 20A, 20B and the second large beams 20C, and is supported by the large beams 20A, 20B, 20C and the small beams 30, and the large beams 20A, 20B, 20C. , And the lower part of the beam 30. Thereby, the slab 40 is joined to the first large beams 20A and 20B which are separated by two spans or more between the columns.
Moreover, the center part of this slab 40 is not supported by the pillar.
In other words, with respect to the slab of the portion surrounded by the small beam 30 and the first large beams 20A, 20B of the slab 40, both end portions in the long side direction are portions joined to the first large beams 20A, 20B. It becomes.

The cantilever slab 50 is a slab supported by the large beams 20A to 20C, and is joined to the upper part of the outer side surface of the large beams 20A to 20C. That is, the slab 40 is joined to the lower side of the large beams 20A, 20B, and 20C on the inside of the building, and the cantilever slab 50 is joined to the upper side of the outside of the building.
Thus, the first large beams 20A and 20B and the second large beam 20C constituting the outer peripheral portion of the building 2 are provided inside the outer peripheral surface of the building 2.
An exterior glass 60 extending from the upper surface of the cantilever slab 50 on the current floor to the lower surface of the cantilever slab 50 on the upper floor is provided at the tip of the cantilever slab 50. Make up surface.

FIG. 4 is a cross-sectional view of the joint between the small beam 30 and the slab 40.
A concave portion 31 extending along the length direction is formed on the side surface of the lower portion of the beam 30, and an engaging portion that engages with the concave portion 31 is formed on a portion of the side surface of the slab 40 that is joined to the beam 30. 41 is formed.

FIG. 5 is an enlarged cross-sectional view of the small beam 30.
On both side surfaces of the lower part of the beam 30, a slab fixing bar 34 penetrating the beam 30 in the width direction protrudes for a predetermined length. The slab fixing bar 34 is fixed in the slab 40 joined to the small beam 30.

The bottom surface of the slab 40, that is, the ceiling surface of the lower floor, is not finished.
On the other hand, a finishing floor 70 is provided on the upper surface of the slab 40 to form a double floor. The finishing floor 70 includes support legs 71 installed on the slab 40 at predetermined intervals, and floor panels 72 supported by the support legs 71. The floor panel 72 is disposed so as to straddle the small beam 30.

  In the underfloor space of the finishing floor 70, for example, equipment piping 73 may be accommodated as shown in FIG. Further, a through hole 32 may be formed in the small beam 30, and the equipment wiring 74 may be inserted into the through hole 32. Alternatively, the pipe 42 may be driven onto the slab 40 to construct the concrete body 43, and cold water or hot water may be circulated through the pipe 42 to perform radiant cooling and heating from the ceiling surface of the lower floor. Further, an air outlet 75 may be provided in the floor panel 72 of the finishing floor 70, and conditioned air may be blown out from the air outlet 75.

Hereinafter, the construction method of the column beam frame 1 will be described with reference to the flowchart of FIG.
In step S1, pillars 10A and 10B are constructed on site.
In step S2, the formwork of the large beams 20A, 20B, and 20C is built, and the formwork of the slabs 40 and 50 is built.

In step S3, the small beam 30 is attached. Since the small beam 30 is a PCaPC beam, it is manufactured in advance at a PC factory or the like.
In addition, with the small beam 30 attached, two places at both ends of the small beam 30 are supported by the support from below (indicated by white triangles in FIG. 1).
Since the small beam 30 is warped upward due to the introduced prestress, the central portion of the small beam 30 is moved to the small beam 30 by allowing a predetermined period of time to elapse while both ends of the small beam 30 are supported by the large beams 20A and 20B. Settling down due to its own weight, correct for peeling.

In step S4, the beams are arranged in the large beams 20A to 20C and the slabs 40, 50, and the concrete is placed. Thereby, the engaging part 41 engaged with the small beam 30 is formed in the slab 40.
By repeating the above steps S1 to S4, the column beam frame 1 is constructed for each floor.

FIG. 8 is a drawing-substituting photograph showing the installation status of the small beams constituting the column beam frame.
. The small beam which is PCaPC is installed at a predetermined position on the mold using a lifting machine in this state by installing a mold having the lower end surface of the beam and the lower surface of the slab as the same plane. As shown in FIG. 8, slab anchoring bars penetrating the rectangular cross section of the beam are projected at a predetermined length on the side surface of the beam. This slab anchorage is anchored in the slab joined to the beam.

According to this embodiment, there are the following effects.
(1) Even if vertical deformation of the slab 40 is caused by the weight of the slab 40 and the load on the slab, the slab 40 is joined and integrated with the side surface of the lower end of the small beam 30. Thereby, the amount of vertical deformation of the slab 40 can be reduced. Therefore, it is not necessary to provide a column on the lower surface of the slab 40, and a portion directly below the slab 40 with a small beam can be used as a large room.

  In addition, since the small beam 30 is provided between the large beams 20A and 20B, the position of the partition wall is not affected by the position of the small beam 30 even when the partition wall is provided. Becomes higher.

  (2) Since the finishing floor 70 is provided on the slab 40 to form a double floor, equipment piping 73 such as water supply / drainage and equipment wiring 74 such as electricity / telephone are accommodated in the space under the double floor. it can. In addition, the ceiling surface of the lower floor can have a structure in which the finishing material is omitted. Moreover, since installation and maintenance of the equipment piping 73 and the equipment wiring 74 between the current floor and the lower floor can all be performed under the floor of the current floor, the influence on the work of the residents on the lower floor can be reduced.

  (3) By introducing pre-stress into the small beam 30, the beam can be lowered, and by using a slab structure with a reverse beam type of small beam, the small beam 30 can be accommodated in the underfloor space of the double floor. Can do. Moreover, since the small beam 30 is a precast prestressed concrete member, even if the span is lengthened, the occurrence of creep and cracks can be prevented.

  (4) Since a large beam is not provided on the outer peripheral surface of the building 2, a large daylighting area of the exterior glass 60 provided at the tip of the cantilever slab 50 can be secured.

  (5) Since the engaging portion 41 on the side surface of the slab 40 engages with the concave portion 31 on the side surface of the small beam 30, the weight of the slab 40 and the loaded load are reliably transmitted to the small beam 30 and the small beam 30 40 can be reliably supported.

  (6) The slab anchoring bars 34 penetrating the cross section of the small beam 30 are fixed to the slabs 40 on both sides of the small beam 30, and the engaging portions 41 on the side surface of the slab 40 are formed in the concave portions 31 on the side surface of the small beam 30. By engaging, the small beam 30 and the slabs 40 on both sides of the small beam 30 can be firmly integrated, and the vertical deformation of the slab 40 can be reliably supported by the small beam 30.

It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
For example, in the above-described embodiment, the concave portion 31 is provided in the small beam 30, and the engaging portion 41 that engages with the concave portion 31 is provided in the slab 40. However, the present invention is not limited thereto. For example, as shown in FIG. 9A, a protruding portion 33 protruding outward is provided at the lower end portion of the side surface of the small beam 30, and a notched portion 44 is provided on the side surface of the slab 40. The protrusion 33 may be engaged with. According to this configuration, the protruding portion 33 on the side surface of the small beam 30 is engaged in the slab 40, whereby the small beam 30 and the slab 40 can be firmly joined. Moreover, as shown in FIG.9 (b), it is good also considering the cross beam 30 as the character shape of the cross section I. FIG.

  Further, as shown in FIG. 10, a slab 40A may be provided on the small beam 30 to form a PCaPC beam having an inverted T-shaped cross section with a slab. In this case, since the area of the slab 40 constructed on site is small, the slab 40 may be made of precast concrete. Moreover, as shown in FIG. 11, the slab 40B larger than the slab 40A may be provided in the small beam 30, and the slabs 40B of the small beam 30 may be joined. According to the T-shaped beam 30 shown in FIG. 10 and FIG. 11, the amount of concrete placement on site can be reduced, so that the construction period can be shortened.

  Further, as shown in FIG. 12, a protruding portion 33 protruding outward may be provided at the lower end portion of the side surface of the small beam 30, and a precast concrete slab plate 40 </ b> C engaged with the protruding portion 33 may be provided. . The slab plate 40C also serves as a slab formwork, and a top concrete 45 is placed on the slab plate 40C. According to this configuration, since a slab is configured by laminating a plurality of concrete bodies, a slab having excellent floor sound insulation performance can be constructed relatively easily.

DESCRIPTION OF SYMBOLS 1 ... Column beam frame 2 ... Building 10A, 10B ... Column 20A, 20B ... 1st large beam 20C ... 2nd large beam 30 ... Small beam 31 ... Concave provided in the side surface of a small beam 32 ... Through-hole 33 ... Small beam Projection part 34 provided on the side surface of the slab 34 ... Slab anchoring bars 40 ... Slabs 40A and 40B ... Slabs attached to the small beam 40C ... Slab plate 41 ... Engagement part provided on the side surface of the slab 42 ... Piping (hot water piping or cold water piping) 43 ... Concrete body 44 ... Notch provided on the side surface of the slab 45 ... Top concrete 50 ... Cantilever slab 60 ... Exterior glass 70 ... Finishing floor 71 ... Support leg 72 ... Floor panel 73 ... Equipment piping 74 ... Equipment wiring 75 ... Air outlet

Claims (4)

A column beam structure of a reinforced concrete building comprising a plurality of columns, a plurality of large beams, and a slab connected to the large beams, wherein the central portion of the slab is not supported by the columns,
A plurality of pillars arranged in at least two rows in a predetermined direction;
At least two rows of first beams spanned between the columns;
A small beam constructed between the first large beams,
A slab joined to the lower side surface of the beam,
Both ends of the slab are joined to the first large beam having a distance between columns of 2 spans or more. The beam is a precast prestressed concrete structure in which tension is introduced,
The column beam frame according to claim 1, wherein the beam beam has a longer span than the second large beam provided adjacent to the small beam. The first girder and second girder constituting the outer periphery of the building are provided inside the outer peripheral surface of the building,
The slab is joined to the lower side of the large beam inside the building,
3. The column beam frame according to claim 1, wherein a cantilever slab is joined to an upper side surface of the large beam outside the building. A recess is formed along the axial direction on the lower side surface of the beam.
The column beam frame according to any one of claims 1 to 3, wherein an engaging portion that engages with the concave portion is formed on a side surface of the slab that is joined to the small beam.

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