JP2017172204A - Roof structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rood structure constructible in a short period, while heightening an indoor ceiling height even in the vicinity of a column and a wall for supporting a roof.SOLUTION: A roof structure 1 comprises a plurality of outer peripheral columns 20, 20A-20C, an outer peripheral beam 33 for connecting the mutual adjacent outer peripheral columns 20, 20A-20C and a truss beam 31 arranged in a quadrangular frame shape in a plan view. A connection member 34 for suspending-supporting the truss beam 31 is joined to the outer peripheral columns 20A-20C. According to the present invention, an indoor ceiling height can be heightened even in the vicinity of a column and a wall of a roof end part, and a roof structure can also be constructed in a short construction period.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a roof structure for forming a large space under a roof of a building.

  Conventionally, a large space roof frame has been required for music halls and indoor stadiums to accommodate various events. As this roof frame, a truss beam structure, an arch structure, a shell structure, and a membrane structure have been developed in order to increase the span between columns. Among them, the arch structure, the shell structure, and the membrane structure have complicated construction procedures and often require a long construction period, and are rarely used as a roof frame. On the other hand, the truss beam structure has been widely adopted as a roof frame because of its clear structural form and easy construction (see Patent Documents 1 and 2).

For example, Patent Document 1 discloses a dome-like structure made of steel truss beams. In this dome-shaped structure, a plurality of truss beams forming an arch shape are arranged substantially in parallel, and a plurality of truss beams are arranged substantially in parallel so as to intersect the truss beams, so that a dome-shaped roof frame is formed. Is formed.
Further, Patent Document 2 discloses a roof frame composed of trussed string beams. The truss string beam is composed of two upper chord members arranged in parallel, one lower chord member arranged along these upper chord members, and a plurality of diagonal bundle members that connect the upper chord member and the lower chord member. Yes.

However, in order to construct a large-scale roof frame only with truss beams, a truss beam having a long span and a large beam length (the height of the beam) is necessary to cover the roof surface. Therefore, in order to keep the beams low, it was necessary to support the roof surface with truss beams installed so as to cross each other, or to narrow the interval between adjacent truss beams.
Further, since the truss beams are composed of a large number of members, when a large number of truss beams as in Patent Documents 1 and 2 are arranged, there is a tendency that the number of joints between the members increases and the construction period becomes longer.
In addition, when the roof frame is constructed with only the truss beams, there is a problem that the ceiling height of the indoor space is lowered near the columns and walls near both ends of the truss beams that support the roof surface, and the usability is lowered.

Japanese Patent No. 4153885 JP 2011-102500 A

  However, since the truss beams are composed of a large number of members, there is a problem that when a large number of truss beams are arranged as in Patent Documents 1 and 2, the number of joints between the members increases and the construction period is prolonged. In addition, when the truss beams are provided on most of the roof as in Patent Documents 1 and 2, there is a problem that the ceiling height in the room is lowered and the usability is lowered.

  In light of the above, an object of the present invention is to provide a roof frame that can increase the ceiling height of a room even in the vicinity of pillars and walls that support the roof and can be constructed in a short construction period. .

  The roof structure of the first invention (for example, roof structure 1 described later) has a plurality of outer peripheral columns (for example, outer column 20 described later, 20A to 20C) and outer peripheral beams (for example, connecting the adjacent outer peripheral columns to each other). , And a truss beam (for example, a truss beam 31 described later) arranged in a rectangular frame shape in plan view, and the truss beam is suspended and supported on the outer peripheral column. A connecting member (for example, a connecting member 34 described later) is joined.

  According to the present invention, the truss beam arranged in a rectangular frame shape in plan view is provided in the central portion of the roof, and the truss beam is suspended and supported from the outer peripheral column via the connecting member. Hereinafter, in plan view, a truss beam having a rectangular frame shape and a structure surrounded by the truss beam are defined as a central roof frame (for example, a central roof frame 37 described later).

The central roof frame bears the vertical load and seismic load of the majority of the roof, and the central roof frame is suspended and supported from the outer peripheral column, so that the seismic load acting on the central roof frame is directly applied to the outer peripheral column. I did not work.
Further, since the truss beam of the central roof frame is supported by being suspended from the outer peripheral column, the ceiling height can be increased even around the edge of the roof.
Further, in the roof structure of the present invention, by providing a central roof frame structure with excellent rigidity at the center of the roof where the amount of vertical deflection increases the most, compared to the case where truss beams are installed over the entire roof, there is less While configuring with the number of members, the amount of vertical deflection of the roof surface can be reduced, and a large space can be constructed immediately below the roof surface.

  As described above, the feature of the present invention is that a central roof frame including a truss beam having a quadrangular frame shape is provided in the central part of the roof, and the central roof frame is suspended and supported from the outer peripheral column via a connecting member. is there.

  In the roof structure of the present invention, it is preferable that one end of the connecting member is joined to the corner of the truss beam constituting the central roof frame, and the other end is joined to the outer peripheral column. Accordingly, the central roof frame can be supported from the outer peripheral column in a suspended manner without applying a bending stress to the truss beam of the central roof frame. In addition, when the roof structure is circular or rectangular in plan view, the connecting member may be joined to a portion other than the corners of the truss beam constituting the central roof frame.

  In the roof structure of the second invention, the connecting member is hinged to a column head of the outer peripheral column and a lower chord material (for example, a lower chord material 311 described later) constituting the truss beam. .

According to the present invention, the connecting member and the truss beam are hinge-joined, and the connecting member and the outer peripheral column are hinge-joined. Therefore, the bending moment generated in the truss beam at the center of the roof due to the weight of the roof or the seismic load is converted into a tensile axial force at the hinge joint between the truss beam and the connecting member, and this tensile axial force is transmitted via the connecting member. , Transmitted to the outer peripheral column.
Further, since no bending moment is generated in the connecting member, the lower chord member of the truss member, and the column head of the outer peripheral column joined to the hinge joint, a large bending moment is generated in the connecting member, the truss beam, and the outer peripheral column. Can be prevented.
Furthermore, the peripheral column constituting the roof structure is not directly subjected to the bending moment generated in the truss beam in the central portion of the roof, but is subjected to an axial force for inclining the roof inward. Thus, since the amount of bending moment is reduced, it becomes possible to reduce the diameter of the beam and column which comprise a roof structure.

  In the roof structure of the third invention, a pair of outer peripheral brace members are disposed on both side surfaces of the outer peripheral column to which the connecting member is joined, and a lower end portion of the outer peripheral brace member is provided outside the outer peripheral beam. It is fixed to a fixed base portion.

  According to this invention, it can suppress that a roof inclines inside by arrange | positioning an outer periphery brace material to the outer periphery pillar which suspends and supports a truss beam, and improving vertical rigidity. In addition, since the outer brace material is arranged outside the outer beam, the effect of suppressing the deformation of the outer column is higher and the seismic performance of the roof is improved compared to the case where the outer brace material is provided along the outer beam. Can do.

  In the roof structure of the present invention, it is preferable that the outer peripheral beam and the truss beam are connected by a plurality of small beams (for example, an outer small beam 35 described later).

  According to the present invention, the vertical load and the seismic load are transmitted from the outer beam to the outer column via the truss beam and the small beam joined to the truss beam, so that the roof can be reliably supported.

  According to the roof structure of the present invention, the ceiling height of the room can be increased even in the vicinity of the pillar or wall at the end of the roof, and it can be constructed in a short construction period.

It is a top view of the roof structure concerning one embodiment of the present invention. It is AA longitudinal cross-sectional view of FIG. It is a perspective view of the roof structure of an embodiment. It is a typical perspective view which shows the main frames of the roof structure of embodiment. It is explanatory drawing (the 1) for demonstrating the force which acts on the roof structure of embodiment. It is explanatory drawing (the 2) for demonstrating the force which acts on the roof structure of embodiment.

  As a large roof frame with a small number of members in the frame and a small member size, the present inventors joined relatively small diameter members having excellent bending rigidity to the center portion of the roof to form a rhombus shape. The truss beam is formed into a suspension structure in which the corners of the diamond-shaped truss beam and the outer peripheral beam are connected by a connecting member. Focusing on the realization of a large roof frame with reduced), the present invention of a roof structure having a truss beam at the center of the roof has been achieved.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view of a roof structure 1 according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view taken along line AA of FIG. FIG. 3 is a perspective view of the roof structure 1.
The roof structure 1 includes a foundation 10 constructed in the ground, a plurality of steel outer peripheral columns 20 provided along the foundation 10, and a steel roof frame 30 supported by the outer peripheral columns 20. And comprising.

  As shown by a broken line in FIG. 1, the base portion 10 is constructed in a substantially square frame shape in plan view. Of the four corners of the base 10, the lower left side in FIG. 1 is the corner 10A, the corner adjacent to the corner 10A is the corner 10B, and the corner located on the diagonal of the corner 10A is the corner. 10C.

  Further, the roof frame 30 has a rhombus shape in plan view. Of the four corners of the roof frame 30, the corner on the lower left side in FIG. 1 is the corner 30A, and the corner adjacent to the corner 30A is the corner. A corner located on a diagonal line between the corner 30B and the corner 30A is defined as a corner 30C.

The corner 30 </ b> A of the roof frame 30 is located immediately above the corner 10 </ b> A of the foundation 10. When the outer peripheral column that supports the corner portion 30A of the roof frame 30 is the outer peripheral column 20A, the outer peripheral column 20A extends substantially vertically from the corner portion 10A of the base portion 10.
Further, a pair of outer peripheral brace members 21A extending along the outer peripheral column 20 is disposed on both side surfaces of the corner portion 30A, that is, the outer peripheral column 20A, and a lower end portion of the outer peripheral brace member 21A is provided outside the outer peripheral beam 33. It is fixed to the foundation 10 made.

The corner portion 30 </ b> B of the roof frame 30 is located inside the base portion 10. Assuming that the three outer peripheral columns supporting the corner portion 30B of the roof frame 30 are the outer peripheral columns 20B, the outer peripheral columns 20B are inclined and extended inward from the vicinity of the corner portion 10B of the base portion 10.
Moreover, about the outer periphery pillar 20 located in a line from the corner | angular part 10A of the base part 10 to the corner | angular part 10B, as it goes to the corner | angular part 10B from the corner | angular part 10A, the inward fall (inclination angle with respect to a horizontal surface) becomes large.
In addition, a pair of outer peripheral brace members 21B extending along the outer peripheral columns 20 and 20B are disposed on both side surfaces of the corner portion 30B, that is, the outer peripheral column 20B, and the lower end portion of the outer peripheral brace member 21B is outside the outer peripheral beam 33. It is fixed to the base part 10 provided in.

The corner 30 </ b> C of the roof frame 30 is located on the inner side of the foundation 10. Assuming that the three outer peripheral columns supporting the corner portions 30C of the roof frame 30 are the outer peripheral columns 20C, the outer peripheral columns 20C are inclined and extended inward from the vicinity of the corner portions 10C of the base portion 10.
Moreover, the part from the corner | angular part 30B of the roof frame 30 to the corner | angular part 30C is substantially parallel to the part from the corner | angular part 10B of the base part 10 to the corner | angular part 10C, and from the corner | angular part 10B of the base part 10 to the corner | angular part 10C. About the outer periphery pillar 20 located in a line, the inward fall is constant.
Further, a pair of outer peripheral brace members 21C extending along the outer peripheral columns 20 and 20C are disposed on both side surfaces of the corner portion 30C, that is, the outer peripheral column 20C, and the lower end portion of the outer peripheral brace member 21B is outside the outer peripheral beam 33. It is fixed to the base part 10 provided in.

FIG. 4 is a schematic perspective view showing the main framework of the roof structure 1. In FIG. 4, the display of the outer peripheral columns 20 other than the outer peripheral columns 20 </ b> A, 20 </ b> B, 20 </ b> C, the inner small beam 32 and the outer small beam 35 described later is omitted.
The roof frame 30 is provided adjacent to the frame-shaped truss beam 31 in a plan view, the inner small beam 32 laid in a lattice shape between the upper ends of the truss beam 31, and surrounding the truss beam 31. A frame-shaped outer peripheral beam 33 that connects the outer peripheral columns 20, four connecting members 34 that connect the lower end of the truss beam 31 and the outer peripheral column 20, and an upper end of the corner of the truss beam 31 and the outer peripheral beam 33. And an outer small beam 35 laid in a lattice shape between them.
Here, the truss beam 31 and the inner small beam 32 that is a structure surrounded by the truss beam 31 are referred to as a central roof frame 37.

  The truss beam 31 has a truss shape in a side view, and a rhombus (rectangular) frame shape in a plan view. That is, the truss beam 31 is configured by joining four truss members 36 extending linearly. The four corner portions of the truss beam 31, that is, the joint portions between the truss members 36 are referred to as corner portions 31A, 31B, and 31C.

  As shown in FIG. 2, each truss beam 31 includes a lower chord material 311 that extends substantially horizontally and linearly, an upper chord material 312 that is disposed above the lower chord material 311 and extends linearly substantially parallel to the lower chord material 311, And an oblique member 313 that connects the lower chord member 311 and the upper chord member 312.

  The outer circumferential beam 33 has a rhombus frame shape in plan view. The outer peripheral beam 33 is supported by the outer peripheral column 20 at predetermined intervals. The four corners of the outer circumferential beam 33 are corners 30A, 30B, and 30C of the roof frame.

The connecting member 34 connects the lower chord members 311 of the four corners 31A, 31B, and 31C of the rhombus-shaped truss beam 31 and the outer peripheral columns 20A, 20B, and 20C. Accordingly, the outer peripheral columns 20A, 20B, and 20C support the truss beam 31 in a suspended manner via the connecting member 34.
These connecting members 34 are hinge-joined to the lower chord material 311 and the outer circumferential beam 33 of the truss beam 31 by a hinge joint portion 341. The hinge joint 341 includes a pin that is substantially horizontal and extends in a direction orthogonal to the length direction of the connecting member 34. The connecting member 34 has the lower chord member 311 of the truss beam 31 and the pin as a rotation axis. The outer circumferential beam 33 is rotatable.

Returning to FIG. 1, the inner beam 32 includes a primary beam 321 that connects the upper ends of the truss beams 31 and extends substantially parallel to each other, and a secondary beam 322 that connects the primary beams 321. .
The outer small beam 35 connects the upper end portion of the outer circumferential beam 33 and the upper end portion of the truss beam 31 and extends substantially parallel to each other, and the secondary small beam 352 that connects the primary small beams 351 to each other. And comprising.

  In the roof frame 30 described above, as shown in FIGS. 5 and 6, when the roof weight P is applied, a compressive force is generated in the upper chord member 312 of the truss beam 31 and a tensile force is generated in the lower chord member 311. Further, a tensile force Q is generated in the connecting member 34, and a compressive force R is generated in the outer circumferential beam 33.

According to this embodiment, there are the following effects.
(1) A central roof frame 37 is provided at the center of the roof frame 30, and the central roof frame 37 is supported by being suspended from the outer circumferential beam 33 via a connecting member 34 to form a suspended roof structure. Therefore, since the bending moment generated in the truss beam 31 of the central roof frame 37 is converted to the tensile force Q of the connecting member 34 and transmitted to the outer circumferential beam 33, the bending moment acting on the constituent members of the roof frame 30 can be reduced. The diameter of the member can be reduced.
Further, since the large roof is constructed by providing the central roof frame 37 including the frame-shaped truss beams 31 only at the center of the roof frame 30, a large space can be realized with a small number of members.
In addition, since the truss beam 31 is installed only in the central portion of the roof frame 30, the truss beam 31 can be easily installed, so the construction period can be shortened. Moreover, since the truss beam 31 is provided only in a part of the roof frame 30, the ceiling height in the room of the roof structure 1 can be increased even around the edge of the roof.

  (2) Since the corner portions 31A, 31B, and 31C of the truss beam 31 and the corner portions 30A, 30B, and 30C of the outer peripheral beam 33 are connected by the connecting member 34, the truss beam 31 and the outer peripheral beam 33 are generated in the constituent members. Bending moment can be reduced.

  (3) The connecting member 34 and the truss beam 31 and the connecting member 34 and the outer peripheral beam 33 are hinge-joined. Since no bending moment is generated at the hinged portion, it is possible to prevent a large bending moment from being generated in the connecting member 34, the truss beam 31, and the outer circumferential beam 33.

  (4) By disposing the outer peripheral brace materials 21A, 21B, and 21C on the outer peripheral columns 20A, 20B, and 20C that support the truss beams 31 in a suspended manner, the roof can be prevented from being inclined inward.

  (5) Since the plurality of outer small beams 35 that connect the outer circumferential beam 33 and the truss beam 31 are provided, the rigidity of the roof frame 30 can be improved.

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 embodiment, the four corners 31A, 31B, 31C of the rhombus-shaped central roof frame 37 and the outer peripheral pillars 20A, 20B, 20C are connected by the connecting member 34 in plan view, but the present invention is not limited thereto. . For example, depending on the roof shape, the outer peripheral beam 33 that connects the outer peripheral columns 20A, 20B, and 20C and the intermediate portion other than the corner portions 31A, 31B, and 31C of the central roof frame 37 may be connected by a connecting member. .
Moreover, in the said embodiment, although the hinge junction part 341 was provided in the both ends of the connection member 34, you may provide not only this but a hinge junction part only in the end of a connection member.
Moreover, in the said embodiment, although the truss beam 31 was made into the rhombus frame shape, it is not restricted to this, You may provide a truss beam further in the diagonal direction between the mutually opposing corner | angular parts.

DESCRIPTION OF SYMBOLS 1 ... Roof structure 10 ... Base part 10A, 10B, 10C ... Corner | angular part 20, 20A, 20B, 20C ... Peripheral pillar 21A, 21B, 21C ... Peripheral brace material 30 ... Roof frame 30A, 30B, 30C ... Roof frame 31 ... Truss beams 31A, 31B, 31C ... Truss beam corners 32 ... Inner beam 33 ... Outer beam 34 ... Connecting member 35 ... Outer beam 36 ... Truss member 37 ... Central roof frame 311 ... Lower chord member 312 ... Upper chord material 313 ... Diagonal material 321 ... Primary beam 322 ... Secondary beam 341 ... Hinge joint 351 ... Primary beam 352 ... Secondary beam

Claims (3)

A plurality of outer peripheral columns;
An outer peripheral beam connecting the outer peripheral columns adjacent to each other;
A truss beam arranged in a rectangular frame shape in plan view,
A roof structure in which a connecting member for suspending and supporting the truss beam is joined to the outer peripheral column.   The roof structure according to claim 1, wherein the connecting member is hinge-joined to a column head of the outer peripheral column and a lower chord member constituting the truss beam. A pair of outer peripheral brace materials are disposed on both side surfaces of the outer peripheral column to which the connecting member is joined,
The roof structure according to claim 1, wherein a lower end portion of the outer peripheral brace material is fixed to a base portion provided outside the outer peripheral beam.

Images