JP2002030726A - Composite girder and composite girder frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the minute oscillation control performance of a large span girder. SOLUTION: There is provided a composite girder which is constructed by forming a truss girder 7 consisting of two chord members 2a and 2b and a number of diagonal members 3 connecting the chord members together, and superposing thereon a Vierendeel girder 8 consisting of the chord member 2b and a chord member 2c, and a number of strut members 4 connecting the chord members together, while sharing the chord member 2b. That is, the composite girder consists of the three chord members 2a, 2b, and 2c, and the diagonal members 3 and the strut members 4 connecting the chord members together. Then, a number of composite girders 1 thus constructed are erected in parallel at intervals, and each of the three chord members of the composite girder is connected to the counterpart of the other composite girder by horizontal joint members, followed by connecting the Vierendeel girders together by diagonal joint members. Thus, facility spaces which are orthogonal to each other, are secured between the mutual truss girders and between the mutual strut members of the Vierendeel girders, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite beam capable of having a large span and excellent in microvibration control performance, and a composite beam frame using the composite beam.

[0002]

2. Description of the Related Art In a clean room such as a semiconductor factory, a high level of vibration control performance is required for a building due to installation of anti-vibration equipment such as a stepper. for that reason,
In the structure of the conventional clean room building, the distance between the columns is set to be relatively small, for example, about 10 m, and the rigidity is sufficiently increased.
As a result, micro-vibration is hardly generated.

[0003]

It is desired that a clean room in a semiconductor factory be able to respond quickly and freely to changes in the production system. Therefore, the building can be freely planned and has excellent flexibility. It is required that there be. However, setting the column spacing small for the purpose of microvibration control as described above is a major constraint on the floor plan, and flexibility cannot be expected.In recent years, for example, a steel-framed large span truss beam has been used. It is also being considered to secure a large space with a small number of pillars. However, mere large span truss beams cannot sufficiently suppress micro-vibration, so that countermeasures are indispensable.

[0004] In view of the above circumstances, it is an object of the present invention to provide a composite beam having a large span and excellent microvibration control performance and having an optimum structure applicable to a clean room and a composite beam frame thereby. It is assumed that.

[0005]

According to a first aspect of the present invention, there is provided a truss beam formed by connecting two chords by a large number of diagonal members.
A composite beam of a form in which one of the strings is connected to the other by a number of bundles, and a feeder-end beam is stacked vertically with one of the strings in common. It is composed of a diagonal material and a bundle material connecting them.

The composite beam frame according to the second aspect of the present invention is the first aspect of the present invention.
A large number of composite beams of the invention of the invention are erected in parallel at intervals, and the three chords of the composite beams are connected by a horizontal connecting member, and the feederend beams of the composite beam are connected by an oblique connecting member. It is made.

According to a third aspect of the present invention, there is provided the composite beam frame according to the second aspect of the present invention, wherein equipment spaces are provided between the truss beams and between the bundles of the feeder-endile beams in directions orthogonal to each other. It is made.

[0008]

1 and 2 are schematic structural views showing a composite beam 1 according to an embodiment of the present invention and a frame formed thereby. The composite beam 1 of the present embodiment has three chords 2 (2a,
2b, 2c) and a large span of steel frame constituted by the diagonal member 3 and the bundle member 4 connecting them. Reference numeral 5 denotes a column, and reference numeral 6 denotes a truss beam constituting a roof frame. The structure and form of these columns and the roof frame are arbitrary.

As shown in FIG. 2, the composite beam 1 of the present embodiment is composed of two chords 2a and 2b,
And a truss beam 7 connected by a bundle 4 and a feeder-end beam 8 formed by connecting two chords 2b and 2c by a number of bundles 4, sharing one of the chords 2b. It is in the form of being stacked up and down in the state of being done. In the illustrated example, the chord material (upper chord material) 2b of the lower half truss beam 7 and the chord material (lower chord material) 2b of the upper half part of the feeder-end beam 8 are shared. The upper half can be a truss beam 7 and the lower half can be a feederend beam 8. Further, in the present embodiment, the bundle member 4 is provided in addition to the diagonal member 3 also on the truss beam 7 in the lower half part, but this may be omitted.

As shown in FIG. 2, a plurality of composite beams 1 having the above-mentioned structure are erected in parallel at intervals, and three chords 2 of the composite beams 1 are connected to each other by a horizontal connecting member 9. At the same time, the feeder-end beams 8 in the composite beam 1 are further connected to each other by a diagonal connecting member 10, whereby a composite beam frame composed of the composite beam 1, the horizontal connecting member 9, and the diagonal connecting member 10 is formed. In the present embodiment, clean rooms 11 and 12 are provided in the lower layer and the upper layer of the composite beam frame, respectively. In other words, this composite beam frame is provided as a main structure constituting a multi-story clean room of a large space. Note that the diagonal connecting members 10 connecting the feeder-end beams 8 function substantially in the same manner as the diagonal members in the truss beams. Therefore, this composite beam frame has almost the same structural behavior in both directions, and It is excellent in stability.

[0011] In the above-mentioned composite beam frame, equipment spaces for installing additional facilities and various equipment flow lines of the upper and lower clean rooms 11 and 12 are secured in two directions orthogonal to each other. That is, a long distribution space 13 is secured in the Y direction (the left-right direction in FIG. 1) between the truss beams 7 as the lower half of the composite beam 1 laid in parallel, and the feeder deal as the upper half. A long return space 14 is secured between the bundles 4 of the beams 8 in the X direction (the left-right direction shown in FIG. 2).

Since the composite beam 1 of the present embodiment has a composite (hybrid) structure of the truss beam 7 and the feeder-end beam 8, the span is larger than that of a normal simple truss beam or a simple feeder-end beam. It is possible to sufficiently secure the degree of freedom and flexibility in the plane planning required for the clean rooms 11 and 12, and it is possible to realize sufficiently high rigidity even in a large span. 12 can also satisfy the microvibration control performance required. In addition, since the equipment space in both directions can be secured without any trouble within the range of the beam structure of the composite beam 1, it is optimally applied to a large-scale multi-story clean room building.

[0013]

According to the first aspect of the present invention, there is provided a composite beam comprising a truss beam in which two chords are connected by a large number of diagonal members and a truss beam in which the two chords are connected by a large number of bundles. It is a form in which a rendir beam is vertically stacked with one of the chords being shared, and is composed of three chords, and a diagonal and a bundle connecting them. Therefore, compared to a simple truss beam or a simple feeler-end beam, it is possible to realize a large span and high rigidity, thus ensuring sufficient flexibility and flexibility in floor planning, excellent micro vibration control performance, and a clean room building It is optimal to apply to

According to a second aspect of the present invention, there is provided a composite beam frame having a plurality of the above-described composite beams installed in parallel at an interval, and connecting three chords of the composite beams with a horizontal connecting member. The diagonal connecting members are connected by the diagonal connecting members, so that the diagonal connecting members function substantially like the diagonal members of the truss beams. Therefore, the composite beam frame has almost the same structural behavior in both directions. And have excellent structural stability.

The composite beam frame according to the third aspect of the present invention has a structure in which equipment spaces in directions orthogonal to each other are provided between the truss beams and between the bundles of the feeder-end beams, respectively. Therefore, the equipment space in both directions required for the clean room can be secured without any trouble, and therefore, it is most suitable as a frame of a large-scale multi-story clean room building in a semiconductor factory or the like.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a schematic structure of a composite beam according to an embodiment of the present invention and a frame using the composite beam.

2 is a sectional view taken on line II-II in FIG.

[Explanation of symbols]

Reference Signs List 1 composite beam 2 (2a, 2b, 2c) chord material 3 diagonal material 4 bundle material 7 truss beam 8 fieldende beam 9 horizontal connecting material 10 diagonal connecting material 11, 12 clean room 13 distribution space (equipment space) 14 return space (Equipment space)

Continuing on the front page (72) Inventor Takashi Tsujii 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (72) Inventor Tomihiro Hori 2-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation F term (reference) 2E001 DG00 EA06 FA01 GA51 HB02 2E163 FA12 FB23 FB31 FB32 FB42

Claims (3)

[Claims] 1. A truss beam formed by connecting two chords by a large number of diagonal members and a feederend beam formed by connecting two chords by a large number of bundles. What is claimed is: 1. A composite beam having a form in which three strings are stacked, and a diagonal member and a bundle member connecting the three members are arranged in a vertically stacked state in which the strings are shared. 2. A plurality of composite beams according to claim 1, which are erected in parallel at intervals, and three chords of the composite beams are connected to each other by a horizontal connecting member. A composite beam frame characterized by connecting two members with a diagonal connecting member. 3. The composite beam frame according to claim 2, wherein equipment spaces in directions orthogonal to each other are secured between the truss beams and between the bundles of the feeder-end beam. Composite beam frame.