JPH0626101A - Dome roof and construction thereof - Google Patents

Abstract

PURPOSE:To utilize an advantage on the execution of works of a double-layer truss and an advantage with respect to the cost of a single-layer truss, to lower the introduction of prestress and to reduce mandays on operation and temporary construction cost. CONSTITUTION:A member overhung toward an arena section 14 from a building 12 is formed in a double-layer truss 16, and the member has rigidity at the time of construction, thus lowering prestress for preventing deformation by deflection. A member joined with the double-layer truss 16 and stretched onto the arena section 14 is formed in a single-layer truss 18, thus decreasing the usage of a roof member. Compression rings 26 are disposed to the joining sections of the double-layer truss 16 and the single-layer truss 18, thus giving force working in the radial outward direction of the truss 16 to the double-layer truss 16 by one ring material, then giving force working in the radial inward direction of the truss 18 to the single-layer truss 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dome roof covering a large space such as a stadium and a method for constructing the dome roof.

[0002]

2. Description of the Related Art At present, a dome roof covering a large space of a building such as a stadium has been developed so that a game can be performed regardless of rain.

By the way, the dome roof structures currently proposed include a multi-layer truss (referred to as a space truss or a parallel chord truss) and a single-layer truss (referred to as a plane truss).

As shown in FIG. 11, since the dome roof 44 having a multi-layer truss structure is constructed by itself having rigidity, it can be lifted up as it is and bridged in the building space. However, since the amount of structural members used is larger than that of a single-layer truss, economical design was not possible. On the other hand, the dome roof with a single-layer truss structure is
It can be said that it is economical when considering the cost of the roof member.

However, the dome roof 40 of the single-layer truss structure shown in FIG. 10 is constructed for the first time by straddling the space of the building and joining the outer periphery of the dome roof 40 to the upper part of the building. . Therefore, at the construction site, after constructing the dome roof 40 on the temporary gantry 42 assembled to the height of the roof at the time of completion, joining the outer periphery of the dome roof 40 to the building, and completing the dome roof 40 as a whole. The method of removing the temporary gantry 42 is adopted.

However, if the temporary gantry 42 that supports the entire dome roof 40 is assembled and disassembled, the construction period cannot be shortened and the temporary construction cost cannot be reduced. Further, since the construction of the dome roof 40 is performed at a high place, the degree of freedom of work is limited, quality control becomes very difficult, and further, a fall,
The incidence of fall accidents also increases.

Therefore, in order to reduce the number of temporary gantry and avoid work at high places, the dome roof is divided into an inner member that covers the central portion of the space and an outer member that covers the outer peripheral portion of the space. A method is also possible.

According to this split construction method, the inner member constructed near the ground is lifted up and joined to the outer member constructed so as to project from the upper part thereof toward the space along the outer periphery of the building, Since the entire dome roof can be constructed, the number of temporary gantry can be reduced.

However, in the above-mentioned construction method, the inner member is lifted up by the temporary gantry for lifting up arranged on the outer peripheral portion of the inner member.
During the lift-up, it is necessary to support at many points or to introduce prestress in the circumferential direction of the inner member so that the inner member is not deformed by its own weight. Since the material is a cantilevered single-layer truss that projects toward the space of the building, it is also necessary to introduce prestress in the radial outward direction in order to prevent flexural deformation. For this reason, the number of work steps and the cost of introducing prestress increase, and there is a problem in adopting the lift-up method which is advantageous in terms of construction period and safety.

Further, there is also a dome roof structure in which a tension ring which applies a prestress to the outer peripheral portion of the inner member is attached, and a compression ring which applies a prestress to the inner peripheral portion of the outer member is attached. Although proposed, the number of ring members and reinforcing members increases, and cost reduction cannot be achieved.

[0011]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention takes advantage of the construction advantage of a multi-layer truss and the cost advantage of a single-layer truss, and reduces the introduction of prestress. The purpose of the present invention is to provide a dome roof and a method of constructing the dome roof that can reduce the number of work steps and temporary costs.

[0012]

A dome roof according to claim 1, wherein a dome roof covering a space provided in a central portion of the building is constructed along the outer periphery of the building and extends from the upper part of the building toward the space. It is characterized in that it is composed of a multi-layer truss that overhangs, and a substantially hemispherical single-layer truss that is joined to the inner peripheral portion of the multi-layer truss and bridges over the space.

In the dome roof according to the second aspect, a ring member that applies a force to the outer radial direction of the multi-layer truss and a force to the inner radial direction of the single-layer truss is interposed,
The feature is that the inner peripheral part of the multi-layer truss and the outer peripheral part of the single-layer truss are joined.

In the method of constructing a dome roof according to a third aspect of the present invention, in the method of constructing a dome roof that covers a space provided in a central portion of a building, the dome roof extends from the top of the building toward the space along the outer periphery of the building. The first step of joining the projecting portion of the multi-layer truss constructed by dividing each block to the ring material that gives a force to the outer radial direction of the multi-layer truss, and the substantially hemispherical shape spanning the space The second step of applying a prestress to the single-layer truss in the circumferential direction to lift it up, and joining the outer peripheral portion of the single-layer truss to the ring material to release the prestress applied to the single-layer truss And a third step of performing.

[0015]

In the invention according to the above structure, since the member projecting toward the building space is a multi-layer truss and has rigidity at the time of construction, prestress for preventing flexural deformation can be reduced. . Further, since the member joined to the multi-layer truss and bridged over the space of the building is a single-layer truss, the amount of roof members used can be reduced.

Further, by disposing the ring material into which the prestress has been introduced over the entire circumference of the joint between the multi-layer truss and the single-layer truss, the single-layer material allows the multi-layer truss to extend radially outward. A force acting on the single-layer truss can be applied to the single-layer truss in the radial direction thereof. As a result, the introduction of prestress can be reduced, and the member cross section of the ring material itself can be reduced. Further, the member cross sections of the multi-layer truss and the single-layer truss can be reduced.

[0017]

1 and 2 show a dome roof 10 constructed by the method for constructing a dome roof according to the first embodiment.

The dome roof 10 covers a circular arena portion 14 and a stand portion 20 provided in the center of the building 12. On the upper part of the building 12, a multi-layer truss 16 forming the outer peripheral part of the dome roof is arranged along the outer periphery of the building 12,
It is constructed so as to project toward the upper part of the arena portion 14. As a result, as shown in FIG. 1, the locus drawn by the inner peripheral portion of the doughnut-shaped multi-layer truss 16 has a circular shape in plan view.

At the inner peripheral portion of the multi-layer truss 16, a substantially hemispherical single-layer truss 18 constituting the central portion of the dome roof 10 is formed.
The outer peripheral portions of the are joined and bridged over the arena portion 14 (see FIG. 2).

In such a dome roof 10, since the multi-layer truss 16 has a certain rigidity at the time when the multi-layer truss 16 projecting to the arena portion 14 is constructed, a pre-deflection for preventing flexural deformation is provided. You can reduce stress. Further, by using the single-layer truss 18 as the member forming the central portion of the dome roof 10, the cross section of the member is reduced and the amount of roof members used can be reduced.

Here, a method for constructing the dome roof according to the first embodiment will be described. As shown in FIGS. 4 and 5,
A temporary gantry 22 is arranged on the ground of the arena 14 while avoiding the stand 20. The temporary gantry 22 is a single-layer truss 1
When lifting up 8, the single-layer trusses 18 are arranged in such a number that the deformation can be suppressed below the allowable deformation. As shown in FIG. 4, the temporary gantry 22 is composed of four standing H-shaped steels and is reinforced by braces (not shown). Further, the temporary gantry 22 is arranged in a circular shape along the inner peripheral portion of the arena portion 14 and is integrally connected by a lateral member. The projecting portion of the multi-layer truss 16A, which is divided and assembled into blocks, is supported by the upper end of the temporary gantry 22. This multi-layer truss 1
As shown in FIG. 3, 6 is assembled outside the building 12, hung by the crane 30, and connected at the upper part of the building 12 to sequentially build the outer periphery of the dome roof, and the upper part of the arena part 14 is connected. To cover.

Next, as shown in FIG.
A substantially hemispherical single-layer truss is constructed on the temporary gantry 24 assembled so that the locus drawn by its tip from the ground surface is substantially hemispherical. When the construction of the single-layer truss 18 is completed, the single-layer truss 18 is lifted up by a hydraulic jack or winch (not shown) provided above the temporary gantry 22. Next, the single-layer truss 18 is attached to the temporary gantry 22.
Is lifted up to the upper part, and the outer peripheral part of the single-layer truss 18 and the inner peripheral part of the multi-layer truss 16 are joined. As a result, the single-layer truss 18 is joined to the outer peripheral portion of the multi-layer truss 16,
Demonstrate the strength peculiar to the dome roof.

Next, a method for constructing the dome roof according to the second embodiment will be described. As shown in FIG. 3, the multi-layer truss 16 </ b> A, which is divided into blocks and assembled, is suspended from the outside of the building 12 by a crane 30 or the like and attached to the upper part of the building 12. This blocked multi-layer truss 16
The tip of the compression ring 26 (see FIG. 9)
To be joined to.

Next, as shown in FIG. 9, the arena part 14
The single-layer truss 18 is constructed on the temporary gantry 24 assembled near the ground. When the single-layer truss 18 is constructed, as shown in FIG.
The prestressing cable 32 is attached along the chord direction and jacked up to introduce prestress in the circumferential direction of the single-layer truss 18. As a result, the number of temporary gantry 22 serving as support points for jacking up can be reduced.

Next, the single-layer truss 18 is lifted up by a hydraulic jack or winch arranged on the temporary gantry 22. At this time, since the prestress is introduced into the single-layer truss 18, the single-layer truss 18 is not deformed in the diameter expanding direction. When the single-layer truss 18 is lifted up to a predetermined position, the outer peripheral portion of the single-layer truss 18 is joined to the compression ring 26. As a result, the compressive force acting on the compression ring 26 is applied to the single-layer truss 18
It is reduced by releasing the pre-stress of, and the cross section of this member can also be reduced.

[0026]

Since the present invention has the above-mentioned structure, the construction advantage of the multi-layer truss and the cost advantage of the single-layer truss can be utilized. Also, by adopting a divided structure, the height of the dome roof can be easily changed by changing the curvature of the single-layer truss, and an economical design becomes possible.

Furthermore, since the lift-up method, which is advantageous in terms of construction period and safety, can be adopted, it is possible to shorten the work process and reduce the temporary construction cost.

Further, by sharing the compression ring, the member cross section of the compression ring itself and the member cross sections of the single-layer truss and the multi-layer truss can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of a dome roof structure according to a first embodiment.

FIG. 2 is a sectional view of a dome roof structure according to the first embodiment.

FIG. 3 is a side view showing a state in which a multi-layer truss having a dome roof structure according to the first embodiment is constructed.

FIG. 4 is a plan view showing a temporary gantry of the dome roof structure according to the first embodiment.

FIG. 5 is a sectional view showing a temporary gantry of a dome roof structure according to the first embodiment.

FIG. 6 is a plan view of a dome roof structure according to a second embodiment.

FIG. 7 is a cross-sectional view of a dome roof structure according to a second example.

FIG. 8 is a plan view showing a state in which prestress is introduced into a single-layer truss having a dome roof structure according to the second embodiment.

FIG. 9 is a side view showing a method for constructing a dome roof structure according to a second embodiment.

FIG. 10 is a sectional view showing a construction state of a conventional single-layer truss.

FIG. 11 is a sectional view showing a construction state of a conventional multi-layer truss.

[Explanation of symbols]

 16 Multi-layer truss 18 Single-layer truss 26 Compression ring (ring material)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshihiro Ishikawa 8-21-1, Ginza, Chuo-ku, Tokyo Stock company Takenaka Corporation Tokyo Main Store (72) Inventor Hiromichi Yamada 8-21, Ginza, Chuo-ku, Tokyo No. 1 Incorporated Takenaka Corporation Tokyo Main Store (72) Inventor Tomohisa Okuno 8-21-1, Ginza, Chuo-ku, Tokyo Incorporated Takenaka Corporation Tokyo Main Store (72) Inventor Kazuhiro Inoue Chuo-ku, Tokyo Ginza 8-21-1, Takenaka Corporation Tokyo Main Store (72) Inventor Toshiya Kashimura 8-21-1, Ginza, Chuo-ku, Tokyo Takenaka Corporation Tokyo Main Store (72) Inventor Matsuzaki Husuma Takenaka Kogyo Co., Ltd., 8-21-1, Ginza, Chuo-ku, Tokyo (72) Inventor Yasuhiko Suto Stockholder Takenaka Kogaku-East, 8-21, Ginza, Chuo-ku, Tokyo This store

Claims (3)

[Claims] 1. A dome roof covering a space provided in a central portion of a building, wherein the multi-layer truss is constructed along the outer periphery of the building and extends from the upper part of the building toward the space, and the inner periphery of the multi-layer truss. A dome roof, which is composed of a substantially hemispherical single-layer truss that is joined to the space and bridges over the space. 2. A ring member for applying a force to the outer radial direction of the multi-layer truss and a force to the inner radial direction of the single-layer truss is interposed, and the inner peripheral portion of the multi-layer truss and The dome roof according to claim 1, wherein an outer peripheral portion of the layer truss is joined. 3. A method for constructing a dome roof for covering a space provided in a central part of a building, wherein a force is applied to a radial direction of a multi-layer truss projecting from the upper part of the building toward the space along the outer periphery of the building. Firstly, the projecting portion of the multi-layer truss constructed by dividing each block is joined to the ring material
Step, a second step of applying a prestress in the circumferential direction to the single-layer truss having a substantially hemispherical shape and being lifted up in the circumferential direction, and joining the outer peripheral portion of the single-layer truss to the ring material. And a third step of releasing the prestress applied to the single-layer truss, and a method for constructing a dome roof.